Happy Home Pet Products Small Animal Vacuum Sealed 8 oz Clear Plastic Mounted Water Bottle

I was concerned about buying these bottles when I read the negative reviews, but my son's hamster had 6 babies, we needed a water bottle for each one, and I was trying to keep costs down. After having bought and setup 6 of these bottles, this is what I found: These water bottles do NOT leak if you follow the directions. 1) Make sure that the black rubber ring (gasket) inside the water bottle cap is seated at the bottom of the threads. If the ring is offset and gets pinched when you tighten the cap or is entirely missing then the bottle will leak from the cap. 2) Fill the water bottle all the way to the top so that it is FULL of water... not a quarter of the way, not half way, not three quarters... but completely FULL, the bottle MUST be filled until it is FULL or else it will leak. 3) Once the bottle is full and the cap is screwed on, turn the bottle upright and roll your finger across the metal ball in the tip to make sure water comes out. If it seems like there is not enough water coming out of the tip then hold the bottle with the metal tip down and give the bottle a gentle squeeze so that a few drops of water come out, then a gentle shake to get the air bubbles to float to the top, and finally check the tip again to make sure that water flows when the metal ball is rolled. If you think you've got a drippy bottle then you can place a small ceramic plate underneath the tip to catch the water and verify the problem without swamping your cage. If the bottle is dripping too much then take it out, rinse the bottle and metal tip thoroughly, fill the bottle completely full (ALL THE WAY TO THE TOP), check the tip to make sure water comes out when the metal ball is spun, and rehang the bottle. I had one bottle that seemed to drip more than the others but was able to get it to stop dripping by doing this. I recheck each bottle every time the hamster cages are opened to make sure they are not dripping and that they produce water when the metal tip is spun. I've only had them a week but all 6 work just fine.

This is a great item, but when you go to fill it up, it is IMPERATIVE that you fill it all the way to the top (to the rim), otherwise, any air trapped inside of the bottle will cause the bottle to constantly leak. ...The directions did not emphasize the importance of it being completely full - they made it seem more like a 'suggestion' than a mandatory step. Once filled the right way, no issues.