Wow sweet... sounds so simple.. the chlorine and chloramines in the tap water wont affect the soil too much? How many lbs of soil does your kit make?? .
Run an airstone or three in a few gallons of tap water for 24-48 hours and anything negative in the water (well most of the negative stuff) will generally evaporate out of there. I usually have two 5 gallon buckets that I alternate airing/setting water out to de-chlorinate. When I use one, I refill it and let it start sitting out. Then I pop the air stones into the bucket that had been sitting out. I adjust the amounts of water I put in the buckets based on how many plants I am running and pot size. Chlorine is bad but not difficult to deal with.