Dave J. Rupiper DVM, Dipl. ABVP East Petaluma Animal Hospital 1420-B South McDowell Blvd., Petaluma, CA 94954 Phone: (707) 765-9098 Fax: (707) 765-2984 Web: EPAH.net HUMMINGBIRD DIET This recipe has worked for me for years and is quite simple to prepare. 1 cup Corn Sugar (dextrose) 2 teas Table Sugar (sucrose) 1 tablespoon Grenadine syrup (fructose and preservative) 1 cup water Boil all ingredients and when cool add to hummingbird feeder. Clean and sanitize all feeders with each food refill.