You can give yo turtle a hot water bath . Put it in boiling water and let it enjoy the bath. ππ
My friend's turtle likes sunbathing in a kiddie pool in her back yard. Of course he has a platform to get onto if he wants to get out of the water. That's not where he lives though, just where he chills out with supervision. Turtles are known to escape and they are very persistent, so you have to supervise them.