How much water do you think I should use per pot? And thank you very much for the information your sharing.
you are very welcome man, that's why i am here.
on a 5 gallon container i'd give it a good hmm, probably one gallon of water, three times over the day.
ideally it'd be more than that, but leaching large containers can be tricky..
whatever you do water slowly, and only di it if the soil is absorbing it, if the water is running off the top and then down the sides the soil is too dry or has too much soil surface tension (peat heavy mixes are known for this issue, also dense worm castings as well)
if done slowly you'll minimize the risk of the soil mix compacting/restricting as it's watered
with that size of plant it'd probably be ok to run more water than that even, but it's hard to say for sure from just the pics
that looks to be a sativa dom hybrid no?
I've seen sativas be a lil sensitive to higher amounts of phosphorus and potassium
they do tend to like a bit more nitrogen than indicas though, especially outside..
but at LEAST a gallon for each plant, and at least three times over the course of the day.
if anything more waterings of smaller amounts will be more effective than the opposite.
You follow me?
and do NOT let them sit in water at all, well, sure, for like 5 minutes or so to ensure the bottom parts are soaking the water too, but not for any amount of time past that
if you only have drainage holes in the bottom then you want the plant to be UP off the bottom.
you want at least a good couple inches of ground clearance for that.