Tony...after you have the hole...if you want to tap it, I've got a very good assortment of taps. I just tapped a normal 1/4" tube connector to my RODI water tank. No problems.
Forstner bit with slow revolutions or a 'plastic' bit (US Plastics). You can make a 'plastic' bit by intentionally dulling the flutes of a wood bit or just using a cheap dull drill bit.
FWIW-The best I have ever found was using my 600 watt CO2 laser, but I don't have that any more