There's also the option of the Nealy kit if you don't want to invest in a spare and don't want to rely on the goo Nealey Tire Repair Kit - Repair Kits
That's what I got. I read the fine print on the goo... Slime says to use only under 45mph. Above that could unbalance the tire. I've experienced this with other spray-in goo kits. Plus, some of them will destroy the tire or TPMS. The Nealy kit requires some muscle and patience but is a permanent patch good enough for tractor or truck tires, and highway speeds actually help melt it into place.
Neither of these will help a sidewall puncture... you'd need a new tire anyway.
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