One liter of bottled water requires 1 liter of water. One liter of almond milk requires 384. It is absurd that you justify almost 400x water consumption because "at least we get almonds".
I live in Florida. The amount of water I need is independent of bottles. If I drink a gallon of water from a pipe or bottle, I take a gallon of water out of the springs. If I drink a gallon of almond milk, I take 400 gallons from somewhere in California.
Your argument against plastic applies to almost all other things in grocery stores. The argument is specifically applied to water because everyone seems to have a personal grudge against Nestle.
Is bottled water wasteful? Yes. Should we dedicate more energy towards 400x wasteful activities in the same grocery store? Only if you want to be taken seriously.