cat will not eat prescription diet. anything else he can have?

My cat is suffering from FLUTD. The vet put him on Hill's Prescription Diet but he is not eating it at all. I have both the dry and the canned but no luck. I need to know if there is anything I can mix with it, such as canned tuna juice or even fresh fish to entice him into eating,It has been 4 days now and he is not going to get better if he wont touch the food.
 
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