"il faut" (+ interrogative and negative variants: "faut-il" and "il ne faut pas") are neutral phrases which express a "must".
- it is necessary to do it = il faut le faire
However, if you want to personalize the subject, as part of a specific context, you may use other English variants:
- il faut le faire = you have to do it, we have to do it
Because she says "boire", not "voir". I know that you Spanish speakers don't make a difference between the two consonants, but we French speakers do :) "B" is made only with the lips and is short (it's like a voiced "p"), "V" is made with the bottom teeth on the upper lip and is longer.