A couple weeks ago after idleing for 25 minutes or so the Radiator Pressure Relief Valve blew (sometimes refered to as a lower radiator hose) and I lost a lot (or all) of my coolant. Having only a bottle of Evian (spelled backwards "Naive" !) water with me I repaired the "valve", and pored the water in. I was two blocks south of no-where so the next morning I finished filling it with water. Now, what should I do? Would that hose blowing off (it must have vibrated off because I'd been watching the temp., and the Hot light never came on) drained all the coolant, and the water just thined the mixture, or do I probably have straight water in there now? How can I drain it all, and what type (is off the shelf automotive sufficient) and how much radiator fluid should I use ?