How I made a 5 gallon water bottle for rabbits using a bucket and rabbit drinking nipples. The water nipples I used in this video are these https://amzn.to/2R8RqRU . You should be able to use this process to make any size water bottle for your rabbits. I used a 5 gallon bucket so I can put a bucket heaters/stock tank heaters inside it for winter. I’m putting multiple nipples on so I can place this inside one tractor then have a nipple go through to the other. That way I only need to heat 1 bucket this winter for both tractors.