I'd just call it San Pellegrino or bottled water or water. No further embellishment is necessary unless you want to make bottled water sound special. (By the way, the word "natural" is meaningless when it comes to food. Rat droppings are natural.)
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .