I agree with the other commenter, I tend to use a cheaper steel bit but drill slow with water running over it. If you need support for the bit, you can put a piece of tape over where you’re drilling. It keeps the bit on target and the hole a bit more stable.

I like to drill holes in mine, it’s not always safe to do and you should run a bit of water where you intend to drill to stop the dust, but I’ve saved many pots that way