Tactical Vest What Is The Best Water Bladder For A UTG Tactical Vest?

What is the best water bladder for a UTG tactical vest? - tactical vest

I bought a UTG Tactical Vest. Not really sure how different it looks good. I'm in the woods for several days at a time very often, and I want to buy a water hose in the back of the jacket. Unfortunately, they do not know anything about them. The lady who sold me the gun show, said he had a bag on the back of one, but I do not know how or what. Any help is welcome