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I've been using shallow trays (between half an inch for buttons and an inch deep for Coturnix) with glass "gems" from the dollar store in them. The "gems" are just like marbles, except they're flat instead of round, just polished glass beads or stones about the length of a postage stamp and half as wide. This has worked really well, the birds can walk across them and still drink in the spaces in between.
For the trays, I have used either jar lids from things like mayonaise and peanut butter, or small foam trays that produce comes on.
The only down side I've found is that they do dry out very quickly, so I have to check the birds for water every couple of hours, even during the night (but, the dog usually has to go out a couple times a night, so it's not a problem).