My snake runs just fine on a 50/50 mixture of water and
antifreeze. Because I don't ever have an overheating problem I run this ratio since it fight corrosion, raises the boiling point of the coolant, lowers the freezing point of the coolant and lubricates the water pump.
If the mixture caused me to have overheating problems in the summer months I would do whatever I had to do to avoid that issue. For those of us not having overheating issues I would recommend a 50/50 mixture with distilled water.
Bob