Plumbing was a learning lesson to me - looked like 1/2 PEX, but it is really 15mm. Try finding metric PEX on the shelf... Spares should include extra connectors and a couple of feet of each size pipe that your house water system uses. And spare shutoff valve also - to isolate anything that springs a leak inside it (dishwasher, icemaker, etc...).
In lieu of spare slip-on connectors for everything, a set of PEX crimpers and bands are useful to improvise plumbing solutions using what ever is locally available.
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