First,
to AFN buddy!! A great place to learn about your favorite hobby...Ok, your second favorite hobby
Let me ask you a couple of questions...Why-o-why is that fabric pot filled only halfway up? You've got the space, give the same to the roots. Ok, sorry for being blunt, but it needed to be said
Euhm, what I would do is fill that pot up with either worm castings or a highly nutrient rich soil blend. This will solve all your problems in one go. I'd prefer the worm castings as I make 'm myself. Plus I can add the worms to the soil. Boy, are these great little helpers to have in your soil...Anyway, I digress...So fill up those pot to the rim, maybe an inch below and water the soil slowly with dechlorinated water, this is just tapwater set out in a bucket for 24 hours, unless your water company uses chlorine, then you need chemicals to remove that, but I'm not Stateside so I can't help with that.
Add some sort of bennies to the water. They will help the roots in absorbing the nutrirents. Complicated story, just know...Bennies and Myco are your friends.
Then...It's been said before, but I like to repeat
Never use distilled water. It's got all it's electrons removed and will actually attract them and leach them out of your soil...Don't do that, the bennies won't like it either. Even rainwater has stuff in it...Use that if you can collect and keep it clean, otherwise tapwater is usually best. Use your municipary to check the values of your tapwater. If it's safe to drink, it's good enough to use in a grow, just nice to know if you need to add extra calcium or extra magnesium. Or if you are lucky like me...add nothing as there's more then enough in the water already....Handy...
Anyway, Goodluck with your grow. I'm curious to find out how this ends. So please do keep posting