Phalaenopsis orchids

I bought two white Phalaenopsis orchids (commonly known as Moth orchids) in February from a supermarket for $10 each. They were marked down to such a low price because the flowers were coming to an end and the shop needed the space for other products. I snapped them up, repotted them together in a large shallow pot and placed them in the bathroom. After lots of waiting, one of them is flowering again.