I kept and bred both Eastern and Midland Painted turtles a while back. At one point I had 7 adults and about 2 dozen babies. I kept them outdoors from the late spring until early fall. The adults lived in a 550+ gallon pond.
In the winter I brought them indoors because my pond wasn't deep enough for them to hibernate in. They were kept in a custom made tank that was 5'x3'x2'. The water was kept around 76 degrees F. and I had a UVB light with a basking temperature between 85-90 degrees F.
Painted turtles have a omnivorous diet and I fed mine earthworms, crickets, tuna fish, Reptimin stix, koi pellets, freeze dried shirmp, aqutic insect larva, snails, tadpoles, fathead minnows, boiled leaf lettuce, spinach, peas, and aquatic plants.
I haven't kept painted turtles in 7 years so I don't know if I have any pics of the indoor setup. But I'll see if I have any pics of them in the outdoor pond that I kept them in.