Bats do drink water. Bats are pollinators, seed dispensers and pest controllers. Most bats are clean, healthy and not aggressive toward humans. Bats are shy and avoid people. Even sick bats rarely attack, unless they are threatened.
Bats do get rabies, as do most mammals.
Unlike some animals, rabid bats are not aggressive. No matter how much a person may appreciate the contributions of bats to a healthy ecosystem, the unpleasantness of sharing living quarters with them can be intolerable. A liberal deposit of mothballs or naphthalene flakes, an odorous deterrent will generally drive them out. During the daylight hours, check the roost area. The places where you can see daylight need to be sealed, caulked, or screened.