Aren't bees remarkable little creatures. I just love them (all types of bees). I have some watering stations in my city garden with pebbles so that the bees can safely drink. I also have uncovered rain barrels but I float a piece of wood in them for any poor bug who may unfortunately fall in. I found a small bat in one once and started doing this. I check all of the watering stations/barrels every morning in the summer. What I have learned is, never give up on a bee you think has drowned. I scoop them out, put them in my hand, and blow on them to warm them up. If it's cold out I'll take them into the greenhouse. A short time later I can feel the hum of life in my hand. If they are really weak I will make up a solution of sugar water and put a drop on my hand. Then they will extend their proboscis and take a drink. I keep doing this until their strength builds up. Shortly after, they unfurl their wings and do a bit if buzzing. It's the most amazing experience. I've done this with bumble bees too, but mostly honeybees. I've done it many times with pretty much 100% success. Yes, it takes time, but it's so worth it to me. I also knew someone who froze a bumble bee as an experiment and upon thawing, it came back to life. Pretty amazing. Glad your bees were okay. Most people don't realize how absolutely important they are.