I am happy to say I have never spilled anything on any of my harps or anyone else’s.
On a rare occasion I may drink something during practice but I am very careful never to hold a drink over the harp.
In fact I try very hard not to hold anything over my harps. I don’t want to drop anything on my harp. The only thing that gets put over my harp is the tuning key and these days I only use keys that are completely covered in rubber. Not perfect but anything to help minimize any possible damage in case of a drop.