Water water everywhere but not a drop to drink

So, I'm buying my value-ham.

I walk past an overweight roundish man in a gigantic rain coat and fur hat. He seems to be carrying about 30 or 40 shopping bags. He seems a little lost, but I avoid eye contact and simply walk past him.

A member of staff asks him if he is lost or needs help.

He simply replies "WATTA".

She then says "Are you looking for the water section?"

Almost motionless, standing at a 90° angle to the aisle with his face almost touching the opposite side, again he replies "WATTA".

"Right sir, the bottled water is over there..."

"WATTA".

"Is it water you want sir?"

"WATTA."

"Sir, do you need any help?"

"WATTA"

"Do you want me to get somebody?"

... "WATTA!"

:: Member of staff backs away slowly ::