Initially, I used the baggie feeder method.
Pour a baggie (sandwich size ziplock) about 2/3 - 3/4 full of syrup.
Place baggie flat on the bottom of the hive.
With sharp knife, make a couple of slits in the top, but not near the edges.
Another option is to make a few pin holes (wiggle the pin a bit to enlarge the hole) on one side of the baggie first, then lay it flat on the bottom of the hive. You will get a few spurts of liquid, but it makes for a quicker entry and exit.
After doing this most of the spring, I change to a standard entrance feeder, BUT, I put the feeder inside the hive on the follower board.
Depending on where you are, you may not need to feed your bees for very long. In Northern Illinois, they are not taking my syrup anymore.