Of course tortoises drink water..they need too..theyre not like turtles..they dont swim all that well..they're more of a landlock reptile unlike their relatives...Fish drink water in a manner of speaking...via their skin
Nikon, saltwater fish drink through their mouths I thought. Due to the fact that the ocean contains a higher salt content or salinity than their bodies, fish loose water though osmosis via their skin. They replenish lost water by gulping it down. IIRC