I found a place on the web that sells the Flow-rite Pro-Fill line of battery watering systems at a pretty good price. It is
Jan Watercraft Products. Just received a setup for my new Club Car.
I have used this line for many years, first on my RV, then last year when I got an older Par Car. It is very well designed and works with individual manifolds on each battery. So, for a 48v system you would have 24 individual
valves that snap into the correct
manifolds for your batteries. Rubber tubing and a fill port are included to connect the manifolds into a loop. It is very easy to install and only requires scissors to cut the tubing.
The 48v system runs $165, plus $20 for the hand pump. That allows you to stick one end of a short hose into a bottle of distilled water, then give it a few squeezes to top off the batteries. Shipping is free.