Learn Spanish (Spain): Para la supervivencia, usted siempre tendría agua. - For survival, you would always have water.

Tendría comes from the verb tener (to have). Tener has an irregular stem in the conditional tense. Instead of adding the ending to the full infinitive, you use the special stem tendr- and add the ending -ía.

Why do we need the pronoun usted in this sentence? Can't we just drop it?

You can drop it if the context is obvious, but including usted avoids confusion. In the conditional tense, the yo (I) and él/ella/usted (he/she/formal you) forms share the exact same ending. Adding usted makes it instantly clear that we mean "you would have" rather than "I would have".

Why does the sentence begin with Para instead of Por?

We use Para here because it expresses a purpose or a goal. Para la supervivencia means "in order to survive." If you used Por, it would indicate a cause or reason ("because of survival"), which doesn't fit the meaning.

Is it okay to put siempre after the verb instead?

Yes, you could say usted tendría siempre agua, but placing time adverbs like siempre (always) immediately before the verb is the most natural and common word order in Spanish.