If you want basic newbie soil and you have a HD nearby, go with Dr Earth Pot of Gold if they carry it. I use that for all my outside plants (autos included) and mix it about 70/30 with rinsed perlite. I nute my autos starting around 18 days. I don't use "water only" soil because I want to give my autos specific nutes at specific times. Autos are on such a different clock from photos that you need to live on their timetable.
HaHa...I find with age I do everything slower. Better, but slower....... That is my story and I'm sticking to it.
Just saw you mention you’d learnt a lesson there... wondering what that could be...
I noticed that during flowering it accumulated a lot of crap on it. I will give mine a bath after I am done with this quick run. I am thinking that I need a bigger one in the main tent. I am running a 4" can fan wide open and it hasn't been an issue But I like the idea of a spare. How long did you let yours run before it became clogged?
My humidifier clogged mine up pretty quick. Like 4 months
If youre thinking about a soil.....Theirs also a mushroom farm in Campbellford that gives away mushroom compost if you bring pails. I have directions depending on your location.
I may not have been very clear. KIS also sales a water only soil. But I was referring to their nutrient kit that allows you to cut shipping costs out as long as you can source the aeration, compost, and peat. That way you don't have to pay to ship all that stuff. They are a pretty amazing company and what they stand for is why I use them. And as Van said, it will be very easy to re amend that soil for another use. Reducing the costs even more! And I could be wrong but depending on your area I would not really trust a "water only" soil other than those that have been formulated for our target plant.
Maybe call the garden center nearby and ask them if they source/sell any local composted soil mixes from farms in the area. Sometimes they will deliver a half truck for $200 and then you have plenty for a year! If it is legal in your area straight up ask them if they sell some super special soil for your autos...
What would happen if I put a worm from my back yard in my medium ? Running synthetic nutesI overwinter one worm bin in my basement @ 65-70F. Worms thrive @ 60-80F. If you can't do it in your basement, another option is to get an "underbed" low profile tote and stick it in your tent with pots on top of it. You only need to get into the worm bin every 2-3 weeks. If they have enough moisture (you want to see puddling of .5" on bottom in that size tote) and food they prefer to be left alone. My summer bins are outdoors and temps range from 50-90F. I use fish crates (with lids) and load them with water and enough water and media (soil, leaves, whatever) where I have about a 1-2" water puddling. I feed them 2-3 times a summer (old veggies from the farm) and they do fine. I use the next spring, so I just let them roll through winter (majority of worms die), fill my pots from the bins, restock with old dirt, handful of worms, water, food...repeat...that easy. It's having the container, the starter handful of worms, water, food (coffee, veggie peelings) and letting them do their thing. They actually feed off the bacteria of the decaying matter so having that quietly "rotting" somewhere out of the way is the whole process. No stink or mess. In three (3) months you have black gold.
As I have posted here earlier, we eat a lot of eggs (our own) so I have a old yogurt container (with lid) next to the sink. I put all our coffee grounds (we have three local roasters in a population of 10k...priorities!) and crushed eggs shells in it (with some occasional potato, carrot, cucumber peels) and that gets filled about every 5-7 days. I dump this in the basement bin and it 1) gives them food , 2) grit (egg shells) to digest, 3) moisture (always about a cup of old coffee in there). No fruits, onions, dairy, meat...obvious no nos. Stick to what I do and you are golden.
Looking back at what I wrote and laughed...a 300 word answer instead of "basement is fine. 60-80F".
Obviously I am a big fan....and so are my plants!
Autos go into flower based on genetic programming. Bigger pots just means bigger yield rather than later flowering.From what I have heard about with autos, they tend to be triggered to flower when they become root bound. So if you want larger girls I would go with atleast 5 gallon pots. That is just me though. I have only done one auto outside and it turned out pretty terrible. It did not care for the soil it was in and it did not get as much light as it should have. If I were to do it again I would give at least 20 gallons and see what one would do. Thats just me though
You would likely be taking that worms life!
I understand that genetic programming is part of it. I would just err on the side of too much soil as oppposed to not enough. If you use too small of a pot and it becomes rootbound it will also start to flower. 10 gallons probably is enough I have not figured out what the ideal volume of soil is for outdoor autos. I know I have seen some monster autos get planted into raised beds and they pulled about a half pound per plant! Im just advocating for them to try and get the largest yield they can out of them if they are going to take the time and effort to run them outside
...420 can be a little overwhelming with advice but at the end of the day your plant is a weed and will flourish with a solid growing medium and weekly watering. 
