"...they would more likely grab it long before we ever even see it. Likewise our water supplies."
Now that I would believe in a heartbeat. That was the reason for the Victory Gardens. I believe all governments do that.
I used to have an English couple as neighbors. During WWII, he was in the Army and going home on leave when a guy sold him a 'hot' chicken (no, not roasted). He found an old pack or something and put the chicken in it on the train. Since chickens can't see in the dark, they're quiet, so he was able to get it to his recent bride in London and they had a nice chicken dinner, a Big Deal at the time.
There was also a severe reduction in the number of wild rabbits, as good hunters were selling them to the butchers, who were mostly staying in business this way. Tom also advised his wife to only buy 'rabbits' that had their heads on, as some people were selling cats as rabbit meat.
Sue