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A shot is ~ 35 ml to 50 ml, so one to three shots a day. :p

If a human needs about 1L per day on a minimal survival scenario, we're talking 20+ jackets right?

Just get your friends to wear them too.

who gets to drink today?

It's the new drinking game, obvs.

1.5oz in the US, which is about 44mL

That's about the average of 35mL and 50mL. ;)