Some people add some water to the L/D wet, some people bake the L/D wet.
Some people let the Royal Canin Hepatic soak in water for about 3 hours and let them eat it that way, or even blend it a little. 
Apple bits (no skin), watermelon and romaine lettuce, even cherrios are good and safe treats to give. 
The supplements I use (instead of Denamarin) are Vetri DMG and Hepatosupport.  These are much more easy to give verses the Denamarin.
I get them from 
HomeVetŠ Natural Pet Care 
I am orginally from NJ, moved to LI in 96 and have lived in town from Farmingdale, Melville, Copaigue, Stony Brook and now out by Bellport Village 

I have family in Naples, FL too