Water Consumption and Footprint resources?

That sounds like a good project.
Have you seen Cowspiracy yet? If not go see it. Its on Netflix. its also at the public library. and I'm pretty sure you can find it on other movie sites. They also have a "fact sheet" on their website. It even has a cool infographic.

One of the best water consumption of crops vs meat was done in the Netherlands a few years back

I think this is it

http://waterfootprint.org/media/downloads/Report49-WaterFootprintSoy.pdf

and this one is pretty good too

http://waterfootprint.org/media/downloads/Hoekstra-2012-Water-Meat-Dairy.pdf

I don't think accurate numbers are possible with beef.. the fact is beef cattle are pastured for the first year or so of their lives. they drink water from dugouts or wells that are built in the pastures..those are filled by rain water runoff or underground springs...who can possibly measure that?? some water loss occurs just through evaporation during hot weather so even if a well had a measuring device on it as it filled the drinking tanks, who is to say if the cattle drank it all or how much evaporiated during hot summer days?
The ONLY time water consumption can accurately be measured is when the cattle are sold to feedlots and watered using tanks that CAN be measured.
Produce would even be harder because if it rains a lot, no one in his right mind would run irrigation as some produce doesn't do well with too much water and there is no way to measure rain accurately.
since chickens are bred and raised in captivity, that would be easier to measure but I bet that too can vary..extra hot weather would raise the need for water; cooler weather would lower it.