Permanent Hair Removal With Home Electrolysis.Needles, Epilators, Holders.

How do I make water more acidic? Does electrolysis make it acidic?

Whats a cheap way (prefereably possible to do at home) to make water acidic? Do i need to add something? Do i need to do electrolysis?
What does Electrolysis do? Is electrolyzed water a good disinfectant?