Evans coolant is a great product. For my money it is far and away the best coolant available. Water may have slightly better heat transfer properties but it offers nothing else. It seems to me that your cooling system may be inadequate. I would address that issue before I added 1 ounce of water into my motor. Water corrodes, freezes and becomes steam when boiled which is not an effective heat exchanger. If you are using any aluminum parts on your motor that come into contact with coolant they will quickly corrode due to electrolysis. If your motor had a tendency to blow hoses off before, this will become more of an issue with water as the only thing that you can do to prevent water from boiling is to pressurize your cooling system with a higher rated radiator cap. Also, you may be adding lubricant and ccas to your water but you had better closely monitor these additive levels as they fairly quickly become ineffective. If you have ever disassembled a diesel engine that has been run without
antifreeze you will readily see what kind of destruction water can cause even with additives. Also, you are only one cold day away from severe engine damage due to freezing. I know of one hotrodder here in Socal who sold and shipped a car to a guy on the east coast. It was shipped in December without
antifreeze-an oversite on both the buyer and sellers part. By the time the car arrived to the new buyer the block was cracked and ruined. -Bob