help for diy water system?

I am looking and trying to find the best/cheapest way to make my own watering system?
I keep coming across rabbit/chicken/mice "water nipples" and then using 5/16 I.d. Poly tube.

Is that what anyone here has used?
What have you used or what do you suggest?

Thanks

I tried also.
They leak and flood tubs.
After several months of being mad at the world I ordered brass valves from Reptile Basics.

I use this http://www.freedombreeder.com/shop/s...drinking-valve , little more expensive but I like them better than the brass valves which they also sell here http://www.freedombreeder.com/shop/b...drinking-valve