Herbs in coffee cans, hung with zip ties. Drill a hole in coffee cans & zip tie to railings! You could pretty much mount any container, like a box in this same way. bigger containers may require more zip ties.
Bees need very shallow water to drink from. To help hydrate our little pollinators, set up a bee bath by filling a pie pan with marbles and then water. The marbles give the bees a spot to land so that they don’t drown when they come to drink.