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As mention, if you just need to top up, use distilled water. Unless you know what coolant is currently in the car that is your best bet. If it hasn’t been flushed and refreshed, or you think the coolant is original, it would be best to do a full flush and refill and do a pressure test to find out if you have a leak, or another problem. A top up here and there is no big deal, but if you were low enough to through a low coolant light, there may be other issues.
Gelling is just a thickening of the coolant, it doesn’t flow well and causes problems. The Porsche coolant is an “oat” coolant I’m pretty sure and, yes it’s 30 a gallon. But really that’s only 15 a gallon mixed. So it really isn’t very expensive overall. Plus, it’s one of the life bloods of the car, good insurance not to have any issues down the road with a funky coolant mix. YMMV...
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