In soil I think it is best to keep it simple. So I never pH my feeds when I'm in soil and I don't have any trouble. I do have hard well water that's rather high EC even after it comes through the softener so I tend to use reverse osmosis water for most of my waterings. The pH of my well water out of the tap is 7.2 and the pH of my reverse osmosis water is 6.8 and I never check the pH of the nutrient mix once I mix everything up.
I know there's a lot of stuff that has been written about cold water shocking the plants roots and stunting them, but I've never found my water to be cold enough to shock or stunt anything. So for that reason I think a heater in your reserve tank might actually invite more problems than it would solve, anaerobic bacteria become a greater issue at higher temperatures and you require more oxygen pumped through the water to keep them at bay.
You can mix up a weak nutrient mixture and feed every single time you water, that's essentially what I do when I grow outdoors. After a certain time of summer every mixture has feed, but I think that's a little bit more advanced than is wise at this point. I would recommend that you have a bucket with nutrient mix and then your regular water reserve, you feed with your nutrient mix once every two or three feedings and use water from your reserve on the others.
I used to use about a 6-L watering can and I kind of liked it, but it all depends upon how long the spout is and the angles you have to work with in your pouring and everything like that. So you just have to try and see.
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