Water bowls

Hello dear rabbit enjoyers,

Sorry if this is a dumb question, I just haven't been able to find a clear answer. How many water bowls do two bunnies need in their pen? I know that with cats, the consensus tends to be #of cats +1 (so 3 bowls for 2 cats), but what about rabbits? I'd have another bowl out for when they free roam, just wondering if they need two separate ones in their enclosure.

Thanks in advance (: