u/Gartovera

I need help finding something! I'm making my sister a leather canteen for larping purposes, and for general hygiene and safety reasons she wants it to be a metall bottle encased in leather, not pure leather insulated with beeswax or something. Problem is the only metall canteen that have a nice round shape i can find are either those tiny ~150ml things or 1L+. Does anyone know where to get a metall canteen that's maybe 300-500ml that has a nice shape for making a medieval-looking canteen?