Although it is better to ...

Although it is better to treat the water than risk disease, chemically treating water usually involves dangerous compounds like sodium hypochlorite and is not ideal, especially when the people using it are not trained professionals.  There exists a substantial risk of poisoning particularly where children are concerned.  Where a spring exits the ground before it has a chance to mingle with animal droppings etc.  the water should be relatively free of harmful bacteria.  The best case scenario would be to build a cistern and capture the water before it reaches the surface where contamination occurs.  There are several good methods for doing this. I’m happy to help if I can.  If the water is captured in a cistern and yet remains contaminated you could then install filtration or even chemical treatment that would accurately maintain potable drinking water.  If none of this will work and treatment has to be done by the two liter bottle then I suggest using a personal micro filter water purifier.  They are becoming better, higher volume and more affordable all the time.  I hope this helps, pleas feel free to contact me if you think I can help in someway.