After "somehow wresting water rights" from Easterners? In case you haven't noticed, the reason the West tends to get little water these days is that all of their storms get pushed north by high pressure systems, and then land south once again smack-dab in the center of the US. Easterners tend to be desperate to get rid of their winter rains in the last few years, they don't like their flooded homes.
But if you're spoiling for a fight, which your tone through this thread suggests, then fine. You don't want to help pay for problems related to Western drought? Well then Westerners don't want to pay for any of the "omg, horrible winter" problems that people in the northeast, mid-west, and south have had for the last few years. They'll pull out of any disaster relief for the Atlantic area that gets hit by hurricanes. They'll pull out of help for people in the midwest when a tornado demolishes their towns. They'll pull out any help for people with torrential rain and the blizzards that never seemed to end this year. After all, easterners don't have to live in areas where the rains pour into their houses. They could just move west.
Or, we could decide that yes, we actually are a country that has socially evolved beyond being a few regional tribes fighting each other all the time.