Your doctor scheduled a colonoscopy. The procedure itself takes about 30 minutes and you sleep through it. The prep is the hard part. You need to clean out your colon completely so the doctor can see clearly. That means specific foods, specific drinks, and a few comfort items you'll be glad you bought.

This guide covers what to put in your cart. Your gastroenterologist's office will give you specific instructions for your prep. Follow those. Guidelines vary by doctor, procedure time, and which prep solution they prescribe. This is a shopping companion, not a replacement for your doctor's instructions.

What Your Doctor Will Tell You

Your gastroenterologist's office will give you a prep instruction sheet. It covers what to eat, when to stop eating, which prep solution to use, and when to take it. Follow those instructions exactly. Every detail matters for a successful procedure.

Most prep instructions involve two phases: a low-residue diet in the days or day before, then a switch to clear liquids only. The timing varies by doctor and procedure. This guide helps you shop for both phases.

The Color Rule

No red, purple, or blue foods or drinks during the clear liquid phase. Some doctors also restrict orange.

The reason: these dyes temporarily stain the lining of your colon. Through the colonoscope, the stains can look like blood or inflammation. That can mask real findings or trigger unnecessary biopsies.

Yellow, green, and clear are safe across the board. When in doubt, skip anything with red, purple, blue, or orange dye. Buy the lemon Jell-O, not the cherry.

What to Buy: Low-Residue Food (Day Before)

If your doctor allows solid food on the day before your procedure, stock up on low-residue options. These are foods that leave minimal residue in your digestive tract. Again follow the your clinic provided instructions.

Good choices:

• White bread, plain bagels, saltine crackers

• Eggs (scrambled, hard-boiled, any preparation)

• Plain chicken breast or turkey (no skin)

• White rice or plain pasta

• Applesauce

• Ripe bananas

• Canned peaches or pears (no skins)

• Plain yogurt or pudding

• Potatoes without the skin

Skip these entirely:

• Nuts, seeds, popcorn, coconut

• Whole wheat bread, brown rice, granola, oatmeal

• Raw vegetables, salads

• Corn, broccoli, cabbage, beans

• Dried fruit, berries with seeds

• Anything with visible fiber

The goal is simple: nothing that leaves bits behind. If it has seeds, skins, hulls, or heavy fiber, save it for after the procedure.

What to Buy: Clear Liquids

A clear liquid is anything you can see through. It doesn't have to be colorless. Apple juice is brown but transparent. That counts.

Broth and Soup

Chicken broth, vegetable broth, or beef bouillon. Fat-free or low-fat versions work best. This is your main source of something that feels like actual food during the clear liquid phase. Buy more than you think you need. Two or three cartons is not overkill.

Juice

Apple juice and white grape juice are the standards. No pulp. Orange juice is out because of the pulp, not the color. Lemonade works if it has no pulp.

Sports Drinks

Gatorade is the go-to. Lemon-lime and yellow are universally safe colors. Glacier Freeze (light blue) is restricted by some doctors. Gatorade Zero versions are fine if you want less sugar.

Some prep solutions require mixing with Gatorade. Your doctor's instructions will tell you how much to buy.

Jell-O

Lemon (yellow) and lime (green) are safe. Peach works too. Avoid cherry, strawberry, grape, blue raspberry, and orange. No fruit chunks. Buy the pre-made cups for convenience.

Popsicles

Same color rules as Jell-O. No cream-based bars, no fruit chunks or pulp. Plain fruit-flavored ice pops in yellow, green, or clear flavors. These feel like a treat when everything else tastes like prep solution.

Soda

Sprite, 7Up, ginger ale, and Sierra Mist are all fine. Ginger ale does double duty if you feel nauseous during the prep. Some doctors restrict colas. Stick with clear-colored sodas.

Coffee and Tea

Black coffee is allowed. Plain tea is allowed. No milk, cream, or creamer of any kind. Not even a splash.

Hard Candy and Extras

Hard candy in approved colors: green apple Jolly Ranchers, butterscotch, lemon drops, peppermints. These are surprisingly useful. Sucking on hard candy between sips of prep solution cuts the aftertaste.

Gummy bears in approved colors are allowed. Yes, really.

Honey and plain sugar are both fine in tea or coffee.

The Prep Solution

Your doctor will prescribe or recommend a specific prep solution. Follow their instructions exactly. Some preps require items from the grocery store (like Gatorade to mix with MiraLAX powder), while others are filled at the pharmacy. Your doctor's office will tell you what to pick up.

If your prep calls for Gatorade, buy the lemon-lime flavor. It's the universally safe color choice and the one most commonly recommended.

What to Buy: Comfort Items

Nobody tells you about these, but they make a real difference.

Baby wipes or flushable wet wipes. You will go to the bathroom many times. Dry toilet paper becomes a problem. Wet wipes are significantly more comfortable by hour three.

Vaseline, A&D ointment, or diaper cream. Apply around the anus before the prep starts. This protects the skin from irritation. It sounds extreme until you're ten trips in.

Soft toilet paper. If you don't use wipes, at least upgrade from whatever is currently in the bathroom.

A straw. Drinking the prep through a straw bypasses more of your taste buds. Small thing, genuine difference.

Entertainment. You'll spend hours near a bathroom. Charge your phone, download a show, grab a book or magazine.

What to Buy: Recovery Food (Day After)

Your stomach will be empty and your digestive system will be reset. Don't come home to an empty fridge.

Easy first meals:

• Crackers and plain toast

• Chicken soup or broth

• Bananas, applesauce

• Plain rice

• Scrambled eggs

• Yogurt

Start bland and work your way back to normal eating over 24 hours. Avoid anything heavy, greasy, or high-fiber for the first day.

Tips That Make Prep Easier

Follow your doctor's instructions for how and when to take your prep. These tips are about making the experience more comfortable.

Chill the prep solution. Cold liquid is easier to drink than room temperature. Refrigerate it.

Chase it. Alternate sips of prep with sips of ginger ale, broth, or a hard candy. Switching flavors cuts the aftertaste.

Stay hydrated. Drink extra clear fluids throughout the process. Dehydration makes everything worse.

Finish the full prep. Even if your output looks clear, don't stop early. Incomplete prep means the doctor can't see everything, and you may need to redo the whole thing.

Arrange a ride home. You cannot drive yourself after the sedation. Most facilities require a designated driver.

The Quick Shopping List

Print this or screenshot it before you go to the store.

Low-residue food (day before):

• White bread or bagels

• Eggs

• Plain chicken breast

• White rice

• Applesauce

• Bananas

Clear liquids:

• Chicken broth (2-3 cartons)

• Apple juice or white grape juice

• Gatorade, lemon-lime (two 32 oz bottles if using for MiraLAX prep)

• Jell-O cups, lemon or lime flavor

• Popsicles, yellow or green

• Sprite or ginger ale

• Hard candy (butterscotch, lemon drops, green Jolly Ranchers)

Prep supplies:

• Whatever your doctor's instructions list (common items include MiraLAX and Gatorade)

Comfort items:

• Baby wipes or flushable wet wipes

• Vaseline or A&D ointment

• Soft toilet paper

• Straws

Recovery food:

• Crackers

• Chicken soup

• Plain yogurt

• More bananas

FAQ

Can I have coffee before a colonoscopy? Yes. Black coffee with no milk, cream, or creamer. Plain tea is also fine. Stop all liquids at the time your doctor's instructions specify, usually 2-4 hours before the procedure.

What color Gatorade is safe for colonoscopy prep? Lemon-lime (yellow-green) is the safest choice. Yellow is also fine. Avoid red, purple, blue, and orange. Gatorade Zero versions follow the same color rules.

Can I eat gummy bears during colonoscopy prep? Yes, as long as they're in approved colors (yellow, green, clear). Skip red, purple, and blue ones.

What color Jell-O can I have? Lemon (yellow) and lime (green) are safe. Avoid red, purple, blue, and orange flavors.

What if something goes wrong during prep? Call your doctor's office. Whether the prep isn't working, you can't finish it, or something doesn't seem right, your doctor's office is the right call. Don't adjust the prep on your own.

Do I really need a driver? Yes. The sedation takes hours to wear off fully, even if you feel fine. Most facilities will cancel your procedure if you don't have a driver present.

Can I eat normally after the procedure? Start with bland, easy-to-digest food. Crackers, soup, toast, bananas. Most people can return to normal eating within 24 hours, but avoid anything heavy or greasy right away. Follow any specific post-procedure instructions your doctor provides.

What happens if I eat something I wasn't supposed to? Call your doctor's office. Depending on what you ate and when, they may reschedule. It's better to reschedule than to go through the prep again because the results were incomplete.

Always follow the specific prep instructions provided by your gastroenterologist's office. Guidelines vary by provider, prep type, and procedure time. This article is a shopping guide, not medical advice.