Sadly, you need the case. The only option I could see here is visiting an Apple Store to see if they would be so kind to let you charge your ear pods. I would tell them you're visiting and left your case at home in some other land. This won't work to many times though ;-}
Sorry ;-{
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== Updated ==
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Here’s a listing of cases now available [https://www.google.com/search?q=airpods+charger+replacement&client=safari&rls=en&source=lnms&tbm=shop&sa=X&ved=0ahUKEwjb5ba6wu3eAhXynuAKHX1eAkkQ_AUIDigB&biw=1180&bih=964|Airpods Charger Replacement]
Sadly, you need the case. The only option I could see here is visiting an Apple Store to see if they would be so kind to let you charge your ear pods. I would tell them you're visiting and left your case at home in some other land. This won't work to many times though ;-}
Sorry ;-{