Household drinking water

What is your solution to clean drinking water in your home? I live in Mexico and always struggle to have supply of 'Garafones' at my place. Their are people selling garafones who come to my place a few times a week, but and random hours and random days of the week. There is no way to coordinate with them. Anyone know of a better solution, maybe a machine that filters the water through the faucet or other system?