The process is simple:
Firstly, sterilize the jars without the lid on for about three minutes. You let them dry. Fill with good quality filtered water to drink. You close the bottle tightly with the lid. Process them in a boiling water bath for about 5 minutes until the lid seals, closing the air bubble. This process is to seal the water caps and prevent air from entering that could contaminate the product.
Find a way to put together special glass jars for food packaging and seal them under pressure. Always be careful to see that the lid in the process is well sealed. This is an easy, almost free way to help support your families, as you never know when you might be without electricity or water for an extended period of time. You can make a good batch and fill them while you are using them, always taking the precaution of leaving a good batch for larger contingencies. You can have them packaged for up to a year. Keep them at room temperature.