Coolant is very important: anticorrosive, antifreeze, antiboil, lubes water pump, prevents cavitation, etc.

To be safe stick to what your car originally came with. This is particularly important for cars with super long life coolant (5 year coolant) like Toyota Pink coolant or Honda Type2 coolant. If you mix another coolant you may have compatibility issues and your coolant life gets downgraded to 2 years only.