Dont forget pistachios. The Wonderful Company grows tons of pistachios in California that can take up to 40-50 gallons per day per tree. Remember folks, your water is going to a luxury snack food!
I'm disappointed to see this answer so far down considering how often the almond milk myth is busted. Animal agriculture uses significantly more water than what else was mentioned in this thread.
https://www.truthordrought.com/almond-milk-myths
Or perhaps US would just have to revise the beef quotas it sets on foreign exporters. A lot of California farm production is designed with costs borne by the public and profits kept private.
It wouldn't stay competitive without a mount of legislative work, quotas and tariffs.