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For light EDC water-only bottle:
What's a good size?
Stainless steel or BPA/BSP free plastic?
Nalgene and Klean Kanteen seem to be highly recommended "buy it for life" brands on a budget.
I plan to also take it when traveling and hiking. Of course for bushcrafting anything, except Nalgene's 38oz, won't do to boil/catch/filter water but that's an overkill for me anyways.