My problem with bowls unless staying put for a while is our little mutt might want a dribble or a litre, you can never tell. So you can end up throwing a lot away.
We recently got what is basically a big hamster bottle (so I'm told, I've never had a hamster), so has a wobbly ball valve that lets out a dribble when he laps at it. Works really well, holds 750ml, non leak cap, not built like a tank but has been durable enough so far.
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