There are no homebrew shops within driving distance, but the local supermarket sells Premier syrup in 1 kg cans. Recipies usually call for 3/4 cup of corn sugar to bottle conditon a 5 gallon batch, but I can't get corn sugar locally. I want to put aside some of the Premier syrup in the freezer to use for bottle conditioning; how much shoud I use?
Sorry, I don't know exactly how much sugar is in that syrup. You could add some to a measured amount of water and take a gravity reading to figure that out. Then with the power of math calculate how much you need.