Just like everything in beekeeping there are several ways to do things and feeding is no exception. The following is how I do it now, having tried just about all the ways in all the books. Bear in mind I'm a hobby beekeeper, no trucks, tanks, or pumps.
I've seen arguments at the local bee club meeting border on religious concerning what a 50/50 mixture exactly is. This is my mixture. Take a jar, whatever size and fill it half way with sugar from the grocery store. Before you put in the sugar, run tap water, as hot as it gets, in the jars to warm them up.
Fill 'er up with water hot from the tap. Let it run first 'till is as hot as it gets.
Now this came out of one of the books. Add 1/2 teaspoon vinegar, to a half gallon, to retard the formation of the black mold the forms in the feed.