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The pink coolant should be changed every 5 years ar 100k miles and is a 50/50 mix and says right on the container "DO NOT ADD WATER". With that being said it would probably be fine if you add some water, but if you fill just the over flow with water, it will freeze. And the amount of coolant in the over flow will go up and down as coolant heats up and cools down. But if it is on the low side all the time check for a leak, if your water pump has never been replaced check it, it is probably starting to leak/getting crusty. When there is a small leak in a vehicle with super long life coolant (pink) it will crust up before it starts to drip.
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