I couldn't sleep so came back to post.
We go a lot and up until this next trip in January where we are FINALLY going to do TS

, we have always eaten on a budget there.
1. Get the free iced water from the CS vendors. Some people complain about Florida water, but the vendor water is pretty good. The water fountains are kind of ickey but not the water from the soda fountains. Don't bother buying bottles of water. Disney kills you the worst with drinks, so drink water. As pp mentiones, you can add flavor packets too.
2. When you do need a soda, you can go to Epcot's Club Cool and drink soda for free. I don't really like any of the flavors, but it's fun. Also, I often get a kid's meal for myself and exchange the juice box for a small soda and that's enough to clear my soda craving. I also believe there are a couple places in Epcot where you can refill your sodas if you buy normal sized ones. Sunshine Seasons and I THINK Electric Umbrella (correct me if Im wrong anyone)
3. Kid meals are often a good portion for adults. Stay away from nuggets, they are too tiny. Mac n cheese meals are great and yummy. Last month I got a kid's chicken drumstick meal from Flametree BBQ at AK and it came with 2 drumsticks. Plenty for me.
4. As mentioned by a pp, share adult meals. Do some reasearch on Mousesavers and Disney Food Blog for which meals to share. Several places give you a half chicken! Thats easily shareable. I do this the often.
5. Speaking of research, do some searching on Disney Food Blog as well as this forum for the best counter service meals and snacks. Disney has some really great places to eat for cheap. You just need to know which ones because other CS places are not good. For example, Columbia Harbour House is one of m favorite places in MK. If you go upstairs, even on high crowd days, it's usually super quite which is a nice break from all the chaos. Their kid's mac n cheese is a good sized portion, even for an adult. They will sub a soda for the juice. They also have an adult meal of grilled salmon, broccoli, and cous cous for around $10. Not man CS meals have something healthy like this.
6. Earl of Sandwich at Downtown Disney is a great place to eat on the cheap. The full sized subs are only $6 and it's REALLY good. To me, this place has the most bang for the buck. The lines are super long though because it's so good. I try to go here when I can but can't always get m DH to go to DTD. Ive heard Wolfgang Express is great too but havent had a chance to try it.
7. Forget meals and just snack on things. Search the top snacks on Disney Food Blog. Bakeries are your friend! For around $5 there are a ton of things you can get that will fill you up. Cupcakes and muffins are giant sized. I share these with my 5 year old and we still can't finish one. A lot of the bakeries have sandwiches for around $6 too. I also do this often.
8. Lastly, you can always bring in your own snacks too. I prefer to buy snacks there since they are so cheap and you get to try new things.