To dream an empty cistern - a person you like does not really have anything but an intriguing appearance. Neither spiritually, nor in the sense of a loving art your new acquaintance has any talents. If the tank you saw in the dream was filled with something, then you need to pay more attention to your house, because you launched it. This is unacceptable, because the house is something like an aquarium in which fish live: if you do not change the water and do not feed the inhabitants of the aquarium, it simply turns into a swamp, and the fish will die of hunger and lack of fresh air.