Is my cat being unreasonable

[ThrilledToTiddlyBits]

To insist on only drinking water out of the kids tumbler in the bath?

For context : DCat is 7 years old, neutered male. He has a split food dish but we stopped putting water in one half as he would crunch his kibble over the water, which would then get manky, so both sides of the bowl are for food, it has been this way for years. We also have a dog, who has a bowl of water down 24/7,cleaned regularly. DCat has always shared the bowl (will only drink it via his paw though, dipping the paw into the bowl then licking the water from his paw, very messy but whatever), again this has been the case for years.

Now, all of a sudden he will ONLY drink from the blue plastic tumbler that lives in the bathroom to assist with washing the kids' hair. To the point that he miaws outside the bathroom door if it's shut, and will race us upstairs and straight into the bath to alert us if his cup needs filling. This water, he will lap up directly, no needing to use his paw. He would apparently die of thirst if the tumbler was not available to him.

Is he BU? Why will he not drink from the dog bowl anymore? DCat and DDog don't appear to have had an argument, they both ignore each other to the same extent they always have. The water hasn't changed that I'm aware of. Does bathroom water taste better than kitchen water? Is it possible there is a faint residue of shampoo that is tempting him to the tumbler?

Is my cat an arsehole BU?

My darling Siamese (so always cold and crying for a cuddle) waits outside the bathroom door calling me to get her fresh water each night as I'm getting mine.

It's quite sweet and gives me a chance to say goodnight to her.

So many of these have made me laugh!

Our little girl will only drink from the tap in the bathroom - at precisely the correct trickle speed, or from a plastic tumbler on the side of the wash-basin.
I often wonder if visitors are perplexed by the full tumbler there all the time, and once, when my daughter's boyfriend first stayed over, he thought she had kindly filled it up for him to swill after brushing his teeth! His face when we told him what he had swilled with...

Dcat also used to drink from our night-time water, but is a clumsy clot and after the 2nd full-glass-spillage, we now take a bottle to bed with us.

It's a good job she is cute!!

I'll have another go. I use these as glasses for the cats as they don't look like they're going to get their heads stuck and they're probably unspillable.

I think they're supposed to be for things like whisky or baileys over ice but they work quite well as cat water glasses.

I've read that cats like glass rather than opaque bowls so they can see their surroundings.

My DH was horrified to find our cat drinking out of his bedside glass. All the more distressing for probably happening for several years before he realised