lol yea they quite like water i find, used to let my adults swim in turtle tank/pond thing id put them on basking rock the male would go drink the water the females would go for a swim and return to the rock same with soaking in water i had a female put her head under for over 2minutes once it was like she was asleep under water
In regards to adding another, possibly but i find theyre best kept on there own (my adults get tank of there own unless breeding) in saying that i have got my 3 babies together im just feeding them well hoping for the best, also watching/waiting for them to start staunching each other out but so far so good, possibly sell another 1 or 2 at a later date.
definitely dont need a "companion" probably best without, theyre solitary critters