Definately purchase the refillable mugs at your resort, here's the tip... bring a small container of dish detergent and a small sponge so you can clean the mugs out after each use. I wish I had, the mugs get yucky in between coffee and soda!
I always save the sample detergents they give out (in the mail, at the store, in the Sunday paper) just for that reason. Soap does not go bad so they will keep until your next trip!
I know what you mean. Once I put tea in my mug and then I noticed how horrible it looked inside. After that I only used it for soda. I must of used some soap and a washcloth to clean it, I can't remember. Those Palmolive sheets are a good idea. I'll bring those next time.
I imagine any one can buy them but they are only good for the resort you buy them at, not the parks or other resorts (although I have read here about people using them at resorts other than the one they bought them at ,from the comments I am guessing it says somewhere for use only where purchased!:
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