If it is lack of water that's making it droop. Start bottom watering if you have a saucer. You fill the saucer with water wait 10 minutes or so, if the soil absorbed all the water fill the saucer again wait 10 minutes or so. If the plant needs more water fill the saucer again. You want to end up with a saucer full of water. Now that's only if the plants using alot if water like your saying it is. You don't want to leave the water in the saucer for days at a time. The next day if there's water in the saucer, empty it out.
you can get sum good water absorption in the soil doing it this way. I would not do bottom watering all the time, but you can mix it up with your top watering.