From my experience with my own Vision Quest---no food, no water, four nights, five days, no weapons, no fire, no leaving your spot...unless you need to go to the 'bathroom'. Five nights if you include the preparatory night. Sweat before and after, in the first honouring the east and south directions, and after honour the west and north directions.
There is then a sharing and assimilation period, and finally, food! :)
Some traditions pierce in a very sacred manner as an offering during their Vision Quests. I did not because of my own preferences.
If someone does pierce though they might bring a small weapon for that.

It's an incredibly sacred experience.
It's something I doubt I'd do again because it is just quite hard, but it was an invaluable experience.

xo~