I too have PV and drink sooo much water! Excessive thirst is a thing with PV. Besides two coffees and two sodas a day, I drink 6-8 16oz bottles. I’m on Hydroxyurea 3X a week now for a year. Took about 7 months to get dosage good. No High BP for me as I was lucky to catch it the very first year it showed up. My annual physical/labs changed in just one year 😒