I am planning to make one more of the containers below for water storage in my room but up the total to 10 gallons. I poured in measuring by the gallon and marked it for easier filling next time. I'll have one for PH adjusted water and one for adjusted water with nutrients. Anything bad about making water for the week ahead of time in this fashion and storing in a plastic container?
As mentioned, you'll want to keep the water moving and aerated. Air pumps work, water pumps work. A water pump left on 24/7 will heat up your water. I run my water pump between my 55gal barrels for 15min every two hours, keeps it from getting stagnant and the waterfall effect aerates the water. If i ran my pump 24/7 then water temp is too warm in the summertime.
I would be careful about putting nutrients into a clear container and letting it sit. I only mix enough nutes for a day or two, i dont like letting stuff like that sit around, seems risky.
Also, i dont have any science to back this up, but im also wary of having acidic solution sitting in a plastic container. Some of these plastic types will leach chemicals into the water. Everything i have plumbed with is food grade or at least for potable water.
That's just some food for thought. It is good that you are planning ahead and trying to make things easier for yourself. I use to have to walk my water into my room, about 400ft from the water source. I'd do 2x pickle buckets at a time, if i was careful i could bring about 11gal per trip. But once i started needing more than 10gal at a time then the carrying of the water got old real fast, lol! Now i have 120gal barrel system plumbed in with pond pump. Highly preferable.