I think it is just an old wives tail or urban myth though I would be happy for someone to prove me wrong because I’ve got a mangy cat scaring all the birds away and sh*tting in my garden.
One theory I heard (sorry, no hard evidence to back this up) is that animals wont defecate or urinate near drinking water, hence the bottles of water.
There is a plant that you put in your garden that is supposed to keep away cats. The name of it escapes me at the moment, I have it written down at home, I’ll dig it out (the name not the plant;)) and post it here tomorrow.
I can’t imagine it works for any better for cats since I’ve seen feral cats habitually defecate in the sand along creeks within metres of the water. I wouldn’t buy the reflection idea either. All the cats I know either ignore their own reflection or are afscinated by it.
I think you have to routinely punish the cat by spraying it with water. Once it makes the connection that the water comes from the bottle, the bottle might keep it away.
This is just a WAG, though, based on several water bottle punishment anecdotes that were posted on the boards here. Search for them, they might prove useful.
I’ve heard that a more effective method is to sprinkle ground hot pepper around the region, as the kitties don’t like it.
I know that my cat would be intrigued by a bottle filled with water rather than repelled—he’s always tipping over my glasses of water as he seems to like watching the water slosh around when he bats at the glass.
I can’t believe that any self-respecting cat would be scared of a water bottle. One of our cats is actually attracted to water bottles. We have four cats, so we thought it would be a good idea to get a couple of those pet water dispensers, so they could always have fresh water.
But our tabby thinks they’re toys, and insists on trying to knock the inverted water bottle over. He usually succeeds.