Water, water, water! Bees love shallow pans of water (put a rock or some pebles in it so they can crawl down to drink). Be careful with pesticides, if you have to use them, do it at night when they aren't around. You can also plant things they like, Hollyhocks, sunflowers and flowers that have lots of pollen and are easy to get into. They feed their young pollen.
Was watering my beds today and remembered your post. Evidentially they are shy about being photographed because the daisies were covered with bees before I got out my camera. Only this one little guy stuck around for a picture.
The well being of honey bees is determined by several key factors. Besides the important things that the hive requires, bees have to have good fresh water available whenever they need it. Next, they need a variety of flowering plants to obtain nectar and most importantly pollen. The more plants you grow that provide an abundant source of nectar and pollen from organically grown plants, the more prolific the hive they support will flourish. The more fresh, running water and non toxic plants (those grown without petro-chemicals) the more robust the bee will be. Look at this photo, it is of bees from some of my hives that I keep. Here they have a source of nectar and pollen from huge prickly pear cactus I grow in Arizona. This is one of several plants I maintain for my bees. The rewards are amazing, healthy flourishing hives that provide the best tasting honey and pollen you can imagine.