Final answer:
The sentence 'Piden por agua' is grammatically correct in Spanish. 'Piden' is the third-person plural form of the verb 'pedir' which means 'to ask for' or 'to order'. 'Por' is a preposition that means 'for'. And 'agua' is the noun for 'water'.
Step-by-step explanation:
The sentence 'Piden por agua' is grammatically correct in Spanish.
'Piden' is the third-person plural form of the verb 'pedir' which means 'to ask for' or 'to order'. 'Por' is a preposition that means 'for'. And 'agua' is the noun for 'water'.
So, the sentence 'Piden por agua' translates to 'They ask for water' or 'They order water'.
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