To save it we need to figure out what the problem is. At this point it doesn't look like it is dying. It may have dried out too much in the two days by a window without watering especially if it was already dry from its original location. Some potting mixes become very hard to re-wet if they get too dry and you would need to soak it in a tub of water. Otherwise any water you give it may run straight through and out without getting to the roots. But first we need to make sure the problem isn't from too much water, hence the question about the weight of the pot.
