Answer:
I am going to order that soup again because it is the best soup I've ever had!
I am going to order that soup again. It is the best soup I've ever had!
I am going to order that soup again; it is the best soup I've ever had!
Step-by-step explanation:
You can fix a comma splice by adding a coordinating conjunction.
I am going to order that soup again because it is the best soup I've ever had!
You can fix a comma splice by separating the independent clauses into two sentences.
I am going to order that soup again. It is the best soup I've ever had!
You can fix a comma splice by using a semicolon.
I am going to order that soup again; it is the best soup I've ever had!