Hmm. I thought I'd responded to this thread, but it must have been another one on the same topic.
If I slam down a liter of water in a few minutes when I didn't start out thirsty, I feel queasy, and hike badly, until I've pissed out the excess. So "cameling up" doesn't work for me.
I hate running out of water, and I'm definitely a sipper. I find if I'm puffing up a mountain, a few sips of water makes my mouth feel a whole lot better, and with my Camelbak I can do that without even breaking stride. So I'll usually start with two litres in that. If I'm not expecting a water source within a few hours, I'll also fill my Nalgene bottle. (I carry one, because once in a while I use it for a hot drink. Recycled beverage bottles won't always take that. Also, if I'm filtering water, it fits my filter.)
Often lately, I find myself hiking in places where the water sources are a very steep quarter- or half-mile off my route. At some point it's less energy just to carry more water than it is to hike down to the water source, refill, and hike back up again.