Some natural cures for cats with cystitis includes increasing the amount of water the animal intakes and decrease the minerals in the diet. Increasing the amount of canned food is a good remedy against cystitis as this type of food often has higher water content, states Earth Clinic.
Feeding a cat dry food can make it dehydrated, which may often lead to cystitis. A kitty water fountain or a bubbler are additional possible remedies for cystitis caused by dehydration. A vet may also suggest adding a urinary acidifier to the cat's diet, which decreases the pH of the urine. Increasing the amount of magnesium in a cat's diet can also be of help, states PetEducation.com.