Dunno why nobody has mentioned pex. White or red pex are fine for use with hot water and it is almost as simple as a garden hose. In fact, you could get a garden hose fitting to connect it directly to your hose bib, or put male hose threads on your pex and connect to the hose bib via a short washing machine hose.

Shouldn't take too much to bury it deep enough to prevent freezing where there's dirt. It'll lose some strength if it freezes, so best to insulate any exposed pipe and into the ground a few inches. You'd just need a few fittings and a pex crimping tool. There's 2 kinds of clamps -- the solid ring type is the most reliable, but either will do.

Going the washing machine hose route could cause issues if someone disconnects the hose to use the hose bib. Could nix that potential problem all together by installing a tee where the spigot is. Only a lawnmower incident or other stupidity could cause issue at that point.