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I will start this off by saying I am not a turtle expert. But, two things here.
1. Turtles of almost all species do not grow quickly. So, it is nothing like having another type of reptile, much less a kitten or puppy. Most "full grown" sized turtles, of whatever species, are over 15 years old. And even if badly kept, most turtles will live for 10 - 20 years. well kept, 50+ years.
2. You should get UVB on the turtle. It will help him be a healthier animal. There are various problems that can result, pyramiding for example. But, in difference to animals like bearded dragons and iguanas, since they live so long, and take so long to grow, the effects at this point are not necessarily detrimental.
The first thing you should do, is figure out what actual species of turtle you have. "Water turtle" could describe hundreds of species of turtle. Where do you live? Where did you find him? DO you have any pictures?
This will help you figure out the best way to care for him. Also, how do you have your tank set up? Does he have a warm basking area? There are a few ways to set the tank up, so if you let me know what you have to start with, I can help you improve it from there.
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