A mason jar stores and seals really good... The vapor from acetone is no more flammable than rubbing alcohol vapors... Do not keep the acetone in a plastic container for extended periods (unless in the form of nail polish remover)... What is considered pure acetone will slowly break down plastic unless it is made specifically for acetone... I wouldn't smoke when working with acetone you could loose eye brows
If possible open a window and use a fan to blow fresh air in... Acetone vapors will get you loopy in higher concentrations... As for storage make sure the lid is secured properly and you can store it safely under your bathroom sink... If you are really uncomfortable with using/storing acetone you may want to consider using verdi-care... Verdi-care can remove a lot of different substances from a coin plus it protects the coin... Hope that helps a bit!!!

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