The HP is groing S/H as a trial (and seems to love it), the others get a thorough watering. Due to the number of plants, they get tap water (ugh, I know), and the phrags get usually 3-5 mins of water running through the bark, a 10-15 min rest and if if required, then a fertilization (maybe a 1/4 gallon of water running through again).
For all but the one mentioned in the other thread, this has worked really well. I have about 15 phrags ... I'll have to pull a list together.