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Ideally light weight PLA would work for this if we’re 3D printing, but off the shelf tanks should be investigated as well.
Prelim research
Really liking the idea of an OTS container because it’ll be more reliable than 3D printing things, from my first look. Amazon link that I’ve been searching: https://www.amazon.ca/s?k=plastic+water+storage+tank+2.5L&crid=2XY0SQTAAPRKO&sprefix=plastic+water+storage+tank+2+5l%2Caps%2C149&ref=nb_sb_noss