I have been teaching makeup safety for years. I agree with everyone's input.
Here are some helpful tips. If you are going to use cream makeup and divide it out on plates, Don't use paper, it will absorb the oil. Use plastic plates or containers that can be covered between performances. Buying individual kits is easier now with several foundation shades in one kit from Mrhon for under $20.
I have done shows at theme parks where we design each character and their box of supplies was designed for them.
You can use soap and water to clean brushes if you let them dry overnight. There is now a Cosmetic Sanitizer available from Mehron that can be used on dry or cream makeup.