My spouse uses 1/4 cup of sugar to a cup of water - as mentioned above - this is standard hummingbird fare. We see several hummingbirds everyday all summer long until they leave in early October. After a few days the water will cloud - pitch it out and replace it with new, clean solution.
I find hummingbirds very challenging - here at home they are pretty nervous and won't sit and wait for one to compose and focus - and chasing a hummingbird with long glass can be very challenging - and I say this as someone who has been photographing birds, owls, eagles for a couple decades....
This little guy or gal was tired in the rain, and was more willing than most to let me photograph it. One really needs to set up multiple strobes to catch them at their best - our feeder is on the north side of our house, so always in the shade, sometimes more, sometimes a bit less, but always lower than ideal light. But the hummers have been coming there for years so we're not about to try to move the feeeders.
7D ISO 3200 1/4 crop 2012