ggileau gave good advice.
when the time comes to mix the 2/1 for fall.. I hat the water to JUST about boiling and shut off the heat.. add the sugar and stir.. it will get milky quick.. keep stirring until it becomes nice and clear and set it aside to cool before pouring it into the feeder.
My experience with spring feeding didnt go as well as most claim it will the first time. I was told to feed/feed/feed and then feed a little more. My bees made a lot of comb quick.. and almost instantly filled EVERY CELL of the comb they made with syrup... it took me a bit to understand why I had so very little brood and my bees were dwindling. I stopped feeding for a couple weeks, and as the queen began filling now empty cells with eggs, I returned to feeding them a little more cautiously. Then they managed to catch up and do well after that.
I have read that once a good FLOW starts they will no longer take the syrup.. Perhaps my bees are greedy.. but if I have syrup out, every single hive begins packing it away as fast as they can. So use a bit of caution! Everyone's bees, Methods, and locations can differ a lot, so becoming a beekeeper also means learning to sift pertinent information out of the encyclopedia of knowledge you are now perusing