indefinite pronoun equivalent of "one" e.g. "one must...", "one might..."

Question

What is the best way to formulate a natural equivalent in Japanese?

From my experience, the most common way seems to be contextual inference. Pronoun dropping is obviously super common, but whether or not that is a way to do doesn't interest me; what is the most natural way to say something like:

one must eat to survive

and retain the information that relates to an unspecified person (explicity). So for a second let's imagine that it was translated:

生き延びるために、食べなきゃ

The problem with that for me is that it loses the meaning in the English that relates to in-specificity. Even 誰か to me seems pretty different, e.g.

生き延びるために、誰か食べなきゃ

Like, how weird does it sound to say "someone must eat to survive" - not really at all an equivalent. Ok ok, apples and oranges to a degree, but if you think about the difference: one refers to someone whether or not they exist, in a sort of timeless semantic space. Whereas somebody has an immediacy that has a much more localized sense of time belonging to its usage and connotation.

Does 誰か have a similar sense of immediacy in this sense? Can I use どれか to refer to people in this situation?

Thanks !

Answer 1

You can use 人:

人は、生きるために食べなければならない。

It makes sense even in English, to a degree - 'a person must eat to live'.