Cat dilemma

[DemonBaby]

I have one cat on a renal diet for kidney stones and the other on a normal diet (both wet food). We are going away for a week at Christmas but our cat sitter can only come once a day and they usually get fed twice a day - we had to do it this way rather than having kibble down all day as otherwise the cat with kidney issues would eat the normal food and she's not allowed it.

I am now unsure what to do over Xmas. Have cat sitter do wet food once a day and buy some of the renal dry food (as prescribed by the vet) and leave this down so they don't get too hungry? I assume the cat with no kidney issues will be ok eating renal kibble for a bit?

I am stuck otherwise as all catteries are full and all my regular cat sitters are away apart from this one.

Any bright ideas welcome!!

Are they both microchipped? If so Get two SureFlap cat feeders and Programme them for one cat each. The things are quite expensive, but will ensure that each cat only eats the right food.
Apologies for the erratic capitalization - autotocorrect strikes again and refuses to change them.

Oh yes they are - I've just looked at those and I'm really not convinced they'd eat out of them, they're really weird about their bowls and quite nervy of anything electronic

They'll be absolutely fine with dry renal food down all the time and separate wet food once a day... that's the standard advice for feeding renal food in a multicat house, it means you're basically supplementing the healthy cat with the stuff missing from the renal food with the wet food.

Just watch for weight gain in the healthy cat as renal food is higher in calories.

Oh and try them on the dry stuff soon in case they refuse it, as it's cats and food...