[header] How to blow up a balloon with baking soda and vinegar [title] Pour a little vinegar into a plastic bottle. [step] Choose a plastic water bottle, or another bottle with a narrow neck. Pour 1-2 inches (2.5-5 cm) of vinegar into the bottle, using a funnel if you have one. 
Use white vinegar, also called distilled vinegar, for the best result. [substeps] You can try this with any kind of vinegar, but the inflation might take longer or require more vinegar to work.