You've got good advice already. Feed you probably don't need much as long as the horse can graze all night and during breaks (you'd need a stake and a long line or hobbles, depending on your culture). If you're travelling in civilised country and he's got money, he might purchase a little grain at inns; he'd definitely have a nosebag. (And with a nosebag, horse can't bite...)
Water: if you're travelling in middle/northern Europe, there'll be plenty of streams and ponds; you'd pick resting places to ensure there's water available and let him drink. Otherwise, villages and inns will probably have a trough or water pump.
How much rest he'll need depends on the roads and the weight of the wagon. The muddier the road, the more rest; ditto if it's very hot and you'd be travelling early morning, siesta, late afternoon.
A not-uncommon problem with horses is balking and not wanting to pass something - pigs (the stench can travel, so Dobbin might suddenly freeze and refuse to move), water, and wooden bridges being the most common, but giving a side-eye to loud noises, smells, and odd shapes/structures (and anything fluttering in the wind) and then flat out refusing to move are common problems. A high-spirited horse might get visibly upset, try to turn around, or run; a more placid horse might simply shut down and get more sluggish the more people try to beat it up.
Getting off and leading frequently works. Extra points if he walks slightly ahead of the horse: many a horse that will not follow when you're walking near his shoulder (the safest place) will walk along if you're the first to be eaten by imagined bears.
no subject
Water: if you're travelling in middle/northern Europe, there'll be plenty of streams and ponds; you'd pick resting places to ensure there's water available and let him drink. Otherwise, villages and inns will probably have a trough or water pump.
How much rest he'll need depends on the roads and the weight of the wagon. The muddier the road, the more rest; ditto if it's very hot and you'd be travelling early morning, siesta, late afternoon.
A not-uncommon problem with horses is balking and not wanting to pass something - pigs (the stench can travel, so Dobbin might suddenly freeze and refuse to move), water, and wooden bridges being the most common, but giving a side-eye to loud noises, smells, and odd shapes/structures (and anything fluttering in the wind) and then flat out refusing to move are common problems. A high-spirited horse might get visibly upset, try to turn around, or run; a more placid horse might simply shut down and get more sluggish the more people try to beat it up.
Getting off and leading frequently works. Extra points if he walks slightly ahead of the horse: many a horse that will not follow when you're walking near his shoulder (the safest place) will walk along if you're the first to be eaten by imagined bears.