Loki loves water and he shares no problem with Sammy. They have huge bowls. You'll need a bigger bowl since 2 of them will be sharing.
We tried having 2 bowls so they didn't have to share and they just both drank out of both bowls. We already have 1 bowl downstairs and 2 upstairs, so they just share all of the bowls. Sam had no idea that hers was pink and Loki's was blue. They are just bowls to them.