One can use tea biscuits – just put a piece of biscuit in your mouth and leave it there. That’s what I’m doing right now at work. 🙂
Anyway, on erev Y”K, I always have a weird issue of being unable to eat a lot. I eat the same as any other day. I might drink a glass more than usual, but aside from that, I do not eat/drink different from any other day. (And I never collapsed on Y”K).