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@_elena If you're in a place with temperatures consistently positive, it probably just woke up from winter dormancy. It was maybe in some wall corner inside or around the window and entered the house. I guess if the house is not super sealed, it might go outside whenever it gets the opportunity to look for insects or eggs in the vegetation, or even find something inside the house...

@_elena Ladybugs are predators, and the favorite food of most species are Aphids. Do you have any house plants that might be infested with aphids or other small bugs? It might be hanging around because of that. It's rare for insects to need water, especially in a controlled indoors environment, unless it's really warm and dry.