I used a 2 3/4" hole saw. Just a tip if you do this, put the drill in reverse otherwise the teeth dig in too fast and it doesn't drill.
The red line in the in and the white pvc is the reverse. From what I have learned is that you want to be able to control the height of the liquid so that once you have roots hanging from the bottom of the basket, only the roots are in the liquid. So before that, you want to be able to raise the liquid level. I manually made sure that my seedling stayed moist until they grew roots out of the bottom.
I think next time I will try using pvc fence post since it is square and should be easier to mount a drain in.
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