Answer:

Introduction:
The given sentence "He offered a water to the guests" is grammatically correct. In this response, we will discuss the sentence structure and the correct usage of articles.

Sentence Structure:
The given sentence follows the basic structure of an English sentence which consists of a subject, verb, and object. Here, the subject is "he", the verb is "offered" and the object is "a water to the guests".

Usage of Articles:
The usage of articles "a" and "the" is a common source of confusion for non-native English speakers. "A" is used before a singular countable noun that is not specific or known to the listener or reader. In the given sentence, "a" is used before "water" because it is a singular countable noun and not specific or known to the guests.

On the other hand, "the" is used before a singular or plural noun that is specific or known to the listener or reader. For example, "The water in the glass is cold." Here, "the" is used because the noun "water" is specific and known to the listener.

Conclusion:
In conclusion, the given sentence "He offered a water to the guests" is grammatically correct. The usage of the article "a" before "water" is appropriate because it is a singular countable noun that is not specific or known to the guests.

He offered water to the guest is the right sentence ..A is not used with water.....