Siphon water in from some tupperware or similar? Pouring water in from above seems like frequent spillage waiting to happen.
Yeah, I'd go with some combination of secondary container and tubing. Less hassle and probably easier to use than a hole in the shelf.
@ChasnotRobert started
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Siphon water in from some tupperware or similar? Pouring water in from above seems like frequent spillage waiting to happen.