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Ellos comprarán agua adicional por si acaso hace mucho calor.

Ellos comprarán agua adicional por si acaso hace mucho calor.
They will buy extra water just in case it is very hot.
From Lesson 273:Precautionary clauses (por si, por si acaso)·Spanish (Latin America)

Questions & Answers about Ellos comprarán agua adicional por si acaso hace mucho calor.

Why is hace in the present tense if they are buying water for the future?
After the phrase por si acaso (just in case) or por si (in case), Spanish typically uses the present tense to talk about a possible future situation. Even though the main action (comprarán) is in the future, the condition stays in the present.
Can I just say por si instead of por si acaso here?
Yes, you can! Both mean "in case" or "just in case." Adding acaso just emphasizes the "just in case" feeling a little bit more, but ...por si hace mucho calor would be perfectly natural and correct here too.
Why do we use hace and mucho for the weather instead of está and muy?
In Spanish, we use the verb hacer (to do/make) with a noun to describe most weather conditions, literally saying "it makes heat" (hace calor). Because calor is a noun (heat) and not an adjective (hot), you must describe it with mucho (much/a lot of) instead of muy (very).
Could I say agua extra instead of agua adicional?
Yes, extra is also a very common word in Spanish and means exactly the same thing in this context. You will hear both agua adicional and agua extra used for "extra water."

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