Disclaimer: This is my FIRST season with bees.
How was the spring flow, and how are their stores? I recently posted a similar question ("Drought planning" in Beekeeping 101), and one reply was to estimate 10 lb of honey per month (for the bees to use.) My hive is pretty well loaded... outer frames of the brood boxes and a few shallow honey supers. I'm thinking mine will be fine (there is a nearby swamp for water) as long as I do not steal all of their honey.
“The keeping of bees is like the direction of sunbeams.” -Henry David Thoreau