Yeah, you're gonna get dirty. Not really 'dirty' as such, but kool-aid stains bad (no duh, that's why you can dye your hair with it) and it's best to be prepared. What do you need to know? kool-aid stains whatever it touches. Your hair, your ears, your hands, your back, your house. Whatever. And it's a bastard (apologies, but it really is) to get out. For that reason, like i said, it's best to be prepared. These are all the things you need to stay clean. Some of them, anyway.

a friend... it'll be cleaner. trust me.

old bucket and cups... cause you're gonna ruin them.

old clothes and towels... cause again, you're gonna ruin them more.

vaseline...smear it on your forehead, neck and ears for protection.

rubber gloves or saran wrap...to save your hands.

bleach and baking soda (baking soda toothpaste is good too)... for cleaning up the mess you make... bleach for the surfaces, baking soda for you.

old hairbrush and/or comb...you guessed it, you're gonna ruin them more.

As you probably figured yourself, it's more an outdoor kinda activity. But indoors is cool, just take more care. Sitting in the shower seems to work, that way you can immediately wash away anything that slops out of your bucket, no risk of stains. Well, a lower risk anyway. Now you know how to keep clean you just have to go and do it. It's what you really want.