Vandas don't have pseudobulbs to store water so they need lots of moisture. They like high humidity and frequent watering. I water my vandas every day in the morning. If you don't have the time, every other day would probably be OK. They also like bright light most of the day with some protection from the strongest light at midday. If you could give it full sun for several hours in the morning it would improve the chances of blooming. Fertilize once a week during the spring and summer.