Years ago when I was still growing, I heard that watering with beer would make the plants stronger. This was years before anyone had heard of hydroponics so this was an indoor crop in dirt, the only way I have ever grown pot by the way. It made it taste like beer, stale beer but beer non the less. Did it make the plants any better? It is hard to say. I made home brew for the CO2 gas it would produce. I am not sure if it was the CO2 or the beer, but the buds were bigger and seemed to be pretty darn strong too, if I remember right. It was good stuff, if only it didn't have that skunky beer taste to it. I was always going to try watering them with stawberries, but never did...always ate the darn things, haha.
In those days, I smoked the bud and sold the leaves to people. The leaves would get you high and were actually pretty good. I remember one outdoor grow where I had like 30 lbs of leaves. They sold for about $150 a pound and bud sold for less. Most people did not even realize back then that bud was better then leaves. In fact, most prefered the leaves and got mad if you sold them buds with seeds in them, they wanted the leaves. That all started to change in the early 70's, maybe even as late as 73 or so.
Anyway, thought I would throw my 2 cents in. I am helping a friend with his grow which is why I am here now.