My T keeps water, coffee and tea available for her clients...but I don't drink there, nor do I bring anything in. My nerves make me have to pee as it is.... I can make it through a session without squirming as long as I'm not drinking before I leave or when I get there. She gave me tea once. Wanted me to try it...as I'd never (gasp!) had tea before. I liked it fine, but OMG halfway thru I was squirming cuz I had to GO. So, I learned. Yet I'm one who goes 6 hours or more between bathroom breaks. Pee before I leave for T, and I go again when I get there usually! ANd it's only a 15-20 minute drive! I often go before I go home again. Nerves suck!