hi,i am trying to figure out a watering system,that does not use pumps that can feed as many different cages as posible.i have two pens that are 2x8ft and 20 that are 1x2ft that i need a system for.any ideas?i thought about a cup system,but i dont know if i can make it work with a gravity system,or if you have to have a pump to supply 5psi.thanks for any help in advance.