You know all those empty plastic bottles piling up next to the sink? Before they were filled with gin they contained water. The ‘Hydros’ filters your water on the go, so you don’t have that disgusting taste from the tap, or the expense of bottled water. A great way to hydrate after a night out. And if you don’t fancy stopping the party you could even stick some shitty vodka in there and hope it comes out like Smirnoff.