What can i do for my poor fish??!!?

I have about 5 guppies in an uncycled 10 gallon (which i thought i could do at first, but the internet has some pretty shitty info). They haven't been doing very well especially the first couple days. They are a little better now. At first they wouldn't eat at ALL i thought they were going to die pretty quickly, but after about 4 days i changed the water 50 % which your not spose to do during cycling, but the fish need it and they got a little better. they started eating a little bit, but not much. I'm just wondering what i can do for these fish. I can't put them into a different tank. My others are 1 and 2 gallons and now emptied and put away and the aeration/ filtration is now in the 10 gallon. So my question is what can i do for these fish so they perk up and start eating and start acting like normal healthy guppies and not just sit on the surface 24/7. Also, will the tank be able to cycle in these conditions? little eating, and likely lots of ammonia. (i don't have a test kit so i don't know for sure and dont have the money to go out ond buy one). Please help save these fish!