Nuun

4 x 12 x 500 = 24,000ml
500ml / Sunday ride = 48 Sunday rides
Sunday ride = 160 miles
48 x 160 = 7680 miles.
Cost = £6 + £1.50 p&p.
10.24 miles per penny.
Value.

I was reading that you should drink a liter per hour. Reckon I drink half that, maybe even less. But I'm looking to be much better at fluid, and food intake.

You either drink ~85ml per hour, or cycle 320 mph.