Anyone recommend cat food for cat with sensitive tummy?

[Louisiasb]

Hi, my six month old kitten started out of Arden grange but after few days in a cattery developed diarrhoea. And so the problems began?

He has been on pure chicken since that episode about 2 months ago. He gets the diarrhoea again if he has any other food. So far we have tried,

Arden grange
James Wellbeloved
iams

Vet has just for all parasites and worms so seems to be just his tummy.

She has recommended hills dd Venison and green pea but crazily expensive.

Just wondered if anyone had found anything that worked!!?

Of course. I am taking about cat swiping a ball of food if dh drops it while pouring. Similar with other cats food.
Not being left to eat a whole bow.
They will be on the same once we find one that the kitten can have!!