i carry the spare sealant inside the tyre.
How do you transfer that spare sealant to the tyre that needs it?
Same here. I carry spare sealant in both. 😀
As has been said spare tube(s) and the tubeless tyre repair kit. I use that Panaracer kit. Check tyre for thorns before fitting tube. I have only needed to do this once I can recall when I burped the tyre off the bead. I have been pleasantly surprised as to some of the holes that have been fixed by the sealant.
The sealant in the tyre will need topping up as it will eventually dry out. If you are a “tyre tart” who changes tyres on a very regular bassis than this may not be an issue. I fit and forget. I have also found that a smear of Vaseline has stopped the valve from gumming up.