It will eat any food but prefers grain. A nibbler, it eats small amounts of food from many sources. Water requirement depends on food. Grains, dog food and cereal have enough moisture, so no water source is needed, but mice do take water when available. Habitual gnawers and collectors of nesting material, mice are generally curious.
Rats require about one ounce of food a day and a half ounce of water.
They feed habitually on familiar food, preferring meats and grains, and are cautious of new items or new food. Your local city hall or public works department may be able to work on private property.