Where's this tap water come from? It's a plane.All these people saying they think there is nothing wrong with them have gone mad. Yes they are a budget airline but when a man is denied his request for a glass of tap water on a flight, however cheap the flight may be is just wrong to me, he had no money on him. Surely they can up all flights by 20p to cover the cost of this.
The water systems on planes don't currently have to be of any specific standard, so it's never usually advisable to drink it - hence it usually says something to that effect in the toilets.