Please research about turtles and find out how best to care for your particular turtle. Just like all animals,turtles do have bacteria and should be handled safely. Feeding I personally feed my turts whole and cut up minnows and small shreds of fish -also floating reptomin and floating trout chow or catfish food will work fine. Be sure and keep live food in the tank so they can hunt if hungry. Every day feeding is ok as long as food is not getting wasted.
Common snappers are similar in feeding but generally more aggresive .
Redears will eat just about anything and like those floating foods. They are much more active than other turts. In the wild most turtles stay in the ground after hatching and dig out in the spring-they are able to live easily on the yolk sac for months. It will probably need some kind of filter unless you want to be changing the water once a week or as needed. If you let the water get real nasty it will turn the turtles green and they will need cleaned off with a toothbrush or something soft like that.