Suck it up princess...

Or wasp. There are a lot of european wasps around at the moment, all of whom seem to be very thirsty. This one is rather fond of the slow dripping garden tap and keeps coming back to it every few minutes. Or maybe it's a different wasp each time. Hard to tell!

If you look at it large, you'll see its foot is resting on the meniscus of the water, without breaking the surface tension.