I have grown orchids for years - they have no roots as such - just the aerial roots that hang down to collect moisture so spray with warm water when it's hot ( like in the jungle where they live). When you water leave them to dry out and then soak them - do not let them stand in water and feed occasionally, when flowers have died off cut off dead stem. There is a lot of very complicated talk about orchids but they are not so complicated at all, just look after them and they will reward you with beautiful blooms all year round, but be patient.