As you are the stronger of the two of you, you naturally will take the heavy spear. Willis gets the helmet, and the game you two decide on is that you must bonk Willis in the head with the spear before he can get you in the torso. To that end, he ends up taking two shortish branches like tonfas, and tries to rely on getting in close to hit you in the chest and body.
The two of you run around the forest, with Willis's wilyness leading to him winning a few rounds, particularly when he climbs trees and can get in close. You certainly win your own share with your speed and reach. Those tonfas do make a clear difference, as otherwise you could grab him when he got in close and then it'd be all over.
So, for a few hours you go sparring, in clearings, in the thick of the brush, on top of rocks, beside the cliff, and over and across the stream. Eventually the two of you get tired and thirsty, ready to get a drink and do something new. But where do you drink?
From the creek. You've been told you could get sick from drinking from it, but you never have gotten sick from it before, and it's right here and cool.
From the village well. It's a good ways away, and the day is hot, so you might have to wait your turn. And the tattered state of your green tunic might get the two of you a scolding from the adults.
From the hunters' house. It's a lot closer than the well, but you've been warned by the hunters to not bother them. Still, on a day like today, they're probably past the ravine out hunting or trapping, and shouldn't be at home. And it's just rainwater anyway, nobody owns rainwater.
From the village inn. The inkeeper likes the two of you and your antics, and might have some cider for you. It's possible there might even be travellers there. But his tavern is all the way down by the road, and you aren't sure if even cider is worth walking that far.