I'm in the process of a guerilla grow, suburban area. DM me if you want Balzac. I'm happy to share what I've got. Picked up a few tricks on my own this time around.
I like to use 1/2 gallon milk jugs for water. I drill several holes in it and bury it about 10 inches from the plant. You can then fill it with nutrients cover and go. If possible, leave the lid opening slightly exposed to catch any rain. This will last you about a month.