It's awesome that you had the foresight to plan for this! I can't tell you how many MUA's I've seen (usually in smaller productions) that aren't aware of the NEED to disinfect in between EVERY person.

Brushes: Using an anti-bacterial wet wip like Wet Ones is a great way to spot clean and disinfect your brushes after every person. You just swipe the head of the brush until the color is gone and give it a couple good brushes on the wipe to disinfect.

Creams: I always recommend scooping out a bit of product onto a palette instead of working right out of the pot/pan. This way, you can just clean the palette with a Wet One in between people. Always put a small amount on the palette first and leave clean scoopers to keep scooping out product.

Powder: This goes for face powder, setting powder, blush, bronzer, powder eyeshadows, etc. Get a bottle of 90% rubbing alcohol and pour some in a spray bottle. Just spray the powder with the rubbing alcohol and let it dry for about 20-30 seconds. Disinfects, dries quickly, and doesn't ruin your product!

Lipstick: Make sure you either use a lip brush, scrape some product off, or clean each lipstick with rubbing alcohol between each person.

Eyelash curlers: Wipe it down with 90% rubbing alcohol, and if you can, disposable pads!

Both Wet Ones and 90% rubbing alcohol will probably cost you $10 together! Good luck!