Ati ulinunua flask wapi? There is a reason why the same flask will be a few shillings more expensive at Uchumi, Nakumatt, Chandarana et al. This is because the premium they charge includes some insurance for cases like yours.
Buy consummables from backwater shops, durables from respected chains.
All is not lost though, you can use the flask to store iced tea

Happy holidays pal!!!