If you make it in small batches, say a half / gallon at a time, WHITE DISTILLED VINEGAR can be your organic pH down ingedient.

Remember rain water today is not rain water like great grandma and grandpa had. It is not the pancea many people would believe.

It can be filled with acids, smog, chemical and all other atmospheric contaminants.

Better off using bottled if you ask me.

HAPPY WATERING