it may depend on where you are in costambar. we had no water delivered for a while (few weeks, maybe) but last week it started coming and now our cisterna is full.
if you want to move to the apartment building you are pretty much f***ed up because there will be plenty of other people using water and there will be problems with getting folks to pay for a water truck. unless, of course, all those things are taken care of by the building owner.
we live in a house with our own, rather large, cistern. there is only two of us so we do not use all that much water but i check the level once a week to see if everything is fine.
problems with water were caused, i think, by the draught, this year it has been very dry. but it has been raining so things are back to normal.