Bees need water! It’s not so much of an issue now in the spring, but in the heat of summer you don’t want them visiting your neighbors’ swimming pools and bird baths. Not everyone is fond of them!
It’s instinctual for us to want to provide clean, fresh water for our pets and livestock, but bees don’t like it that way. For whatever reason, they seem to prefer stagnant water full of debris that has been sitting around for as long as possible. Perhaps that makes it easier to smell?
We do know why they appreciate debris, it’s so they can get a drink without drowning. A perfect solution to your thirsty bee problem is a bowl full of pebbles, moss and leaves, woodchips, or a combination of the above. It’s a good idea to get it in place now so the bees can learn where it is by the time they really need it. If you leave it in a place where rainwater can replenish it, all the better.