Having lived through the Depression she always has good ideas for saving money/resources.
We went to the movies and she bought one extra large cup of soda with no ice. Then she asked for and got two small cups with just ice. She poured the the soda from the xrta large cup into the two with the ice and we each had a cup of soda. LOL! I would have NEVER thought of this! It saved almost $3 as the difference in price from a small to a xtra large is only about $.75. She of course still has a funny consience and would not go back for the free refill you get with an xtra large.

I think this would work at Disney too and plan to try it when we go. If the counter service places give free glasses of ice it should work just fine.
She is also a great meal splitter. One of my favorites that I saw her do was to order a huge double Quarter Pounder for her and Grandpa , then open it up in half, give each of them one bun and a patty for an openfaced burger. I've also seen her get a KFC 4 piece meal and split that between the two (with the soda trick from above). I think this concept would work at Disney too. If you just ordered a bit larger meal than you normally would and split it it would be less than ordering two smaller seperate meals.
She alo walks away from every fast food type restaurant with all the leftover napkins, ketchup and plastc silverware leftover from our meal. She would never go get more from the self service area as that would be stealing, but if you take whats leftover from your meal then thats okay.

She then uses these for picnics and never has to buy these things.
She is so great! I have really come to appreciate her mind set, even while we giggle behind her back when she hands us each a half a stick of gum "because a whole stick is just too much for one person"...
Jennifer