Welcome to the area Tony.  I don't have children here so can't help you on that score.  I'm sure some of the others on here will help.
Regarding water, it depends what you have already.  Do you have your own or a shared (community) well or a regular supply, or will you need to have it delivered.  If the latter, I wouldn't have thought bought containers would be practical.  With children you're going to go through more water than you may have estimated.  Example, we have a well that we use to fill a 1500 litre tank.  This time of year, with watering the garden and a machine load (at least) of washing a day, we go threough that in a couple of days.  Maybe 3-4 days in winter.  That's just for two adults.