There isn't one.
As well as the obvious, anti-freeze properties, antifreeze also has rust inhibitors and most have lubricants that help with moving parts and keep seals from drying out prematurely.
The best reason to use water as a coolant is because is because it has a high specific heat capacity. However, you can add a mix of antifreeze with your water.
Yes. The best to use is of course is a mixture of water and coolant but just water will work fine in your vehicle. Add coolant when you can get some for the best cooling. But only temporarily in an emergency. Water alone was fine (when the temperature stayed above freezing) back in the 1950s, but today's engines need the rust inhibitors and other additives.
Yes, you can add water to coolant, but it's important to use distilled water rather than tap water to avoid minerals that can cause corrosion. Typically, it's best to use a pre-mixed coolant solution or a 50/50 mix of coolant and distilled water for optimal performance. Always check your vehicle's manual for specific recommendations regarding coolant and water mixtures.
use half coolant and half water
You really should use a 50/50 mixture of coolant and water for the best protection.
Only use BMW coolant and distilled water.
Best to use the Honda coolant 50/50 mix.
It should use ethylene glycol coolant. If for some reason you cant find that in the store then use a universal coolant.
Use only Honda Coolant unless you want to replace the water pump which will be damaged if you use any coolant with sliicates in it. Also use distilled water not tap water. Honda sells a premixed coolant for around $5 a quart. Money well spent.
I use antifreeze mixed 50 / 50 with distilled water in my 1995 Ford Explorer as the engine coolant as the Owner Guide shows
Yes, it is best to use distilled water and the anti-freeze has to be replaced before it gets too cold.!
Tap water from your house