Answer:
I will get you some coffee
Explanation:
The simple future in the English language represents a verbal form whose main objective is to represent situations that will happen at that very moment.
To use the simple future, the word "will" is used as an auxiliary to the verb that will be used in the sentence. Thus, the sentence must be assembled as follows:
Subject + "will" + verb (in the infinitive, but without the auxiliary "to", which will be replaced by "will").
Accordingly, the sentence shown above will be spelled correctly as follows:
Mary: "I am about to fall asleep. I need to wake up!"
Clare: "I will get you some coffee."