[header] How to buy citric acid [title] Determine how much citric acid you need to buy. [step] The amount you need will determine where you should shop for citric acid. Smaller quantities can generally be purchased at the grocery store, while larger quantities may need be purchased at a bulk store or online. 
[substeps] Consult the instructions for your activity or recipe to see how much citric acid they indicate you need to use for your project. Increase the amount of citric acid if you plan to make multiple batches of a recipe or want to have an ample amount for repeating the activity.