Nutrient First Aid Kit?

Evening everyone,

I was curious on what everyone's opinion on a Nutrient First Aid Kit would be? I have seen sick plant guides on how to identify whats wrong with your plant, but since I do not have ready access to Hydro shops (90 min drive one way and 2 jobs), I am curious on what nutrients I should keep on hand.

So far the main one that I have seen is Cal-Mag. Is there any other common issues that creep up with Hydro (DWC) setups? Pests are not an issue since I am using tents in a closed room.

Thanks as always in advance.

get ZHO powder, Earth Worm Castings and Aquashield. Buy airstones and a spare pump and learn how to brew tea.
Google Root Slime Cure.

http://www.skunklabshc.com/ made for dwc have not tried the product yet
dwc is known for root rot keep all light and organics out