It depends what kind of turtle it is.Some turtles do not need water and can be kept in a room,or big area.
no it does not
Try to get it, 3 times bigger than your turtle. I have a not so little red eared turtle and i keep it in a large tank.
Nothing a strong one...
You need somethink like a hampster tank With Big Rocks and Water in a container the turtle can suck on also need turtle food im not sure where you can get it but try Rite Aid
You only need one that your turtle can swim in and if you get one to big it is okay they adapt to there inviorment
around 80 degrees.
24-28 C
Water ,heat source ,food ,lighting are about it.
I'm sorry but no turtle can live in a 2.5 gallon tank. You will need a least a 20 gallon tank and that is even iffy when they grow up I would say get a 30-40 gallon tank for one turtle.
a tank alligator?
A bowl for food and water, food, a wheel( for excercise), a playmate
YES, you can put a map turtle in the same tank with a slider.