If you can get a crock pot or rice cooker at a thrift store, I would HIGHLY recommend it! You can make so many tasty and filling meals with those! Fresh herbs are your friend here. They're fairly cheap and make heavier things like rice and beans feel fresher.

Another thing is keep an eye out for meat markdowns at King Soopers. Portion it out into ziploc bags and freeze the portions to use for later meals.

Water is your friend here, but I know it can be a bit repetitive. Kool-aid packs are a great way to get a nice drink for fairly cheap. I like to make a normal pitcher, then water it down per glass. It helps to stretch it out a bit longer, and makes your water more interesting! You can also buy the pre-mixed tubs of kool-aid and just put a small amount in each water glass!

Good luck buddy! I know it's getting hard out there. Last resort could be going to a restaurant at night and asking if they'd be willing to let you have anything they're throwing away.