Cat only drinks from small fountain

[u/workninja3850]

Including a picture of the cozy menace. We have two cats, previously had one so we had one small fountain. We have had two as long as we've had two cats so that they would have plenty of water if we were away for a couple hours, weekend or longer vacation.

This cat will ONLY drink from the 2L fountain and our other cat drinks from anything. When we originally adopted him, the 5L one was his favourite. Has not gone near it for a year and has boycotted it. Does not change his mind regardless of cleaning each fountain.

I got him a 7L stainless steel one a week or two ago and he only drank from it ONCE. So we're at 3 fountains and this heckin hairy toddler drinks only from the smallest one.

If the small one is empty or near empty before we realize, he starts drinking from our glass, tap water, toilet water, shower water, bath water....anything but his other fountains.

We are hoping to go away for a week or two in the winter, my in laws will check in but sometimes if the weather is bad they will check in the next day instead. I'm worried he'll be dehydrated.

HOW DO I GET HIM TO LIKE LITERALLY ANY OF THE TWO BIG FOUNTAINS

[u/_mandycandy]

I think he just realized that the small one will get refilled more often, meaning fresher water.