can you make your own spare air?

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i like to go spearfishing in the rivers and it's usually 6-8 feet deep so i just use my snorkle then but when there are 20ft. hole it'd be nice to take an extra breath or two. so is there any way i could make my own spare air to save some money or do you guys have any other ideas?

I want to make my own light bulbs......:eyebrow:
 

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