Water bottles or gravity fed water system for rats?

I use water bottles. But I only have 3 tubs of rats, so its maintainable. If I had racks, I would probably do a gravity system. I guess it just depends how many rats and tubs you have

In my situation gravity fed is no good. I breed for show. So where a disaster in someone who breeds only feeders' cages would be an inconvenience, and you'd lose some animals, if I had a clogged line or a flood and it killed any of my animals, I could lose an animal that is impossible to replace without years and years of work.

So I use lab bins, with water bottles.
It's a pain in the ass, but It works.

Every darn water bottle I have ever used leaked, are there any suggestions on large non leaking water bottles??

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I have a few large glass bottles with the metal chew proof cap covers and some of the largest size plastic bottles from petco that just say petco on the side. So I have top of the line and store brand. I've never had a leaky bottle unless an ASF got ahold of it.

Gravity fed reservoir system all the way. Much easier to refill and very fun to design and build.

And as long as you keep up the proper preventative maintenance (monthly line flushing, annual valve o-ring replacement) the system is very dependable.