Drill, smaller bit and I stack them about 9 deep, set them upside down and drill. I can drill a pack of a 100 in about 3 minutes or less. That is putting 4 to 5 holes in the bottoms.
No problem with them wicking up water or draining that way.
BTW, no one told me, and I ad never used a drill before, but keep the drill running as you poke the holes in and coming back out.
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