Canada

I'm not sure, but I think one of the objectives of vertical farming is to contain the water cycle as much as possible, limiting the amount of external input.

This will answer your question.

Spoiler: water use is a non issue.

This really is the future.

so how well did this method grow grains

"“At scale, this is the equivalent of 117 tonnes per hectare [52.2 US tons per acre] per year, 26 times that of the average open-field farming yields.”

"In addition to the mobility of indoor farms, vertical farming has the capacity to grow food with 95% less water and 97% less land, according to the USDA, and with no pesticides. There is also the potential for more renewable energy sources; Infarm currently uses 70 percent green-certified energy, with the goal of becoming net-zero by 2045. "

(SOURCE)

Corn and rice have their own unique challenges, which can be addressed via hydroponics, aeroponics and/or some variation of indoor farming. But I believe Saskatchewan only really harvests wild rice, so this is a separate thing.

The reality is that farmers are fighting a losing battle by keeping things outdoors. They can accept that reality, or they can struggle. But we do need to invest in better solutions.

So food is going to get incredibly expensive

Food is already incredibly expensive using traditional methods. Why? Because of the high cost of things that indoor vertical farming nearly eliminates (fossil fuel, water, fertilizer, weather risks, land cost, soil quality, etc.).

It's a trade-off: do you want field-based risks or cost-based risks? With the latter, at least you have control over the crop, yield, input, etc.