"Our committee is a not-for-profit group of volunteers, who are 100% committed to the local community through the delivery of an event that raises money for charity - and one of the only races left where all money goes to charity."
Being a Ltd company doesn't necessarily man they're profit making - it's just a vehicle for doing business. Their aims can still be charitable or they could give all their profits to charity.
It is beyond me how they couldn't find a solution though. Surely all they needed was some plastic dustbins and paper cups? Could have been filled at the houses on route (the local public have been applauded for helping) and any completely rural parts could have used the limited supply of bottled water that was available from local supermarkets.
How much water do you need for a HM in cool conditions anyway?