Some of this depends on where you live. If it gets humid & dewy at night, you can see the condensation on the outside of the tire - can see how much liquid is in them. Or with the valve near the bottom, let some air out - if it"s liquid, you have filled tires. For freezing areas, you want Calcium Cloride - it"s a salt that gets added to the water. It is heavier than water, & makes the solution good & heavy - what you want. It does rust metal if you don"t rinse spills off, however it is not toxic like antifreezes nor as light as they are. There is Rimguard which is made from beet juice that is more expensive but does not rust metal as much. If you live in south Florida (sorry for what you are going through!) or south Texas you can get by with just water. For doing this once, call the local tire folks & have them do it - the service call is cheaper than the fuss & muss. If you need to do this a time or 2 a year, you can get the pieces at NAPA or the like as mentioned. --->Paul
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