Make adjustments to the following sentence so that it is grammatically correct: 
"I'm going to the store, buy some food"
I'm going to the store, buy some food
I'm going to the store to buy some food.
Complete the following task based on the instruction and optional input provided.### Instruction:
Make adjustments to the following sentence so that it is grammatically correct: 
"I'm going to the store, buy some food"

### Input:
I'm going to the store, buy some food

### Output:
I'm going to the store to buy some food.