I take three glaucoma meds and i try to drink a lot of water. could either of these be the cause of pvcs?

No: Anxiety or excess caffeine need be excluded.Need cardiogy evaluation if symptomatic.

It is possible: While some glaucoma medications, especially in the category of beta-blockers, may have heart rhythm side effects, the majority do not. I would recommend discussing your glaucoma drops with your internist or cardiologist. I am not aware of water drinking as a risk factor for arrhythmias.