bromeliads live through the water stored in their "cup" so you don't have to worry much about repotting them ^.^ As for the flower, it lasts around 6 month and then dies off. During the time that the flower is there, it'll have babies sprouting around the edge of the "mother plant" After the flower dies, you can wait for those little baby plants to get good and established and put them in different pots if you wish. Don't keep the soil too wet though. They can survive in dry soil, and ya. Their roots are basically only there to keep them in the ground.

Good luck!
~Phoebe

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