Ray (webmaster) on 7/20/2021 10:35:23 AM:
A lot of the trailheads have running water, which is turned on at all except maybe Dutzow.
Check out this link to the trip planner, listing all the trailheads, libraries, and other places offering free water:
https://bikekatytrail.com/planner.aspx?scid=10&ecid=11&rt=0&svcs=|10|
Of course, there are also convenience stores, restaurants, etc at towns along the way, where you can buy water and other drinks.