I have several that I got from Lidl some of them have been going for 18 months. As soon as one flower finishes another one starts. I have been giving them tap water. (Very hard!!!) I put the orchid pot on top of another pot and keep watering a little bit every few days. The other pots are sainsbury's quark pots. They fill with water and seem to keep the whole plant moist from below. Important to keep the roots moist but not wet the leaves. They also seem to like quite a sunny situation. Have mine on a south facing windowsill, though there are a couple of shrubs giving a little bit of shade. The instructions said not direct sun, but actually seem to like it a lot.
I moved them a couple of weeks ago from sitting room window into bedroom so window could be painted. I have suddenly been getting blisters on the backs of my hands and my face. Think it is something to do with the orchids. Love the flowers looks like I am highly allergic to them. End up half way through the night itching like mad. Last night slept in spare room no itching. My lovely orchids will have to go.