meat uses up enormous quantities of water. potatoes for instance use about 75 gallons to produce 2000 calories compared to say 1500 to 2500 gallons for 2000 calories of beef.
As to alternatives for real meat not grown as animals... we don't even get micro-nutrients for baby formula right... I won't trust alternatively grown meat for a very long time. I and my brother wouldn't have survived on conventional baby formula... I have issues with just about everything outside eggs and red meat.
As for all beef being grass fed/finished... I'd be way more than happy to see it become the norm, exceptions for snowy parts of the year only. I'd like to see regenerative farming, which pretty much requires ruminant cycles, be the norm everywhere... we need more ruminants, not less imo.
I don't have a problem with hunting, as long as it's done sustainably. I have no problem with fishing, as long as it's done sustainably. The problem is that there are too many people and we cannot possibly feed them all meat every day in a sustainable manner.
We drain the land in Iowa otherwise the north half of it would be a swamp. Complaining about water usage for all but the western edge of Iowa is much the same as complaining about how solar panels use up the sunlight.