Great! Thanks. It's almost 1 am where I am. I didn't want to go to bed the wrong way.I agree with Josh. You can use a cinder block for the basking area and bring the water level up close to level with it. You can do this outside so the tortoise can warm up in the sun, but be careful to always have shade available so the turtle doesn't over heat. Check the water temperature to make sure you aren't making turtle soup. It should be dark at night, and its fine if it cools at night.
This type of turtle has to be in the water to eat, so it isn't going to eat in your dry tub there.