My trip report
lists the number of nights we stayed at each camp. Here's a summary of water availability at each of the camps along the normal route.
Water is available to the public in the form of a hose/faucet on the south end of camp, near the ranger tent. Warning: the water is clean/drinkable, however it is very high in magnesium. Neither filtering nor treating the water will remove this mineral. Unfortunately, it acts as a laxative affecting different people in different ways. My partner had no problems, whereas I had bad stomach cramps and some diaria. I don't know of any alternative other than to carry water, which is not practical in large quantities due to the distance.
Plaza del Mulas
A glacial stream runs through camp. The expedition/mule companies collect water upstream through hoses which are routed to their tents. If you hire mules to pack in your gear, which I strongly recommend, the mule company will provide you with water, even hot water if you ask for it. We drank the water without any problem.
There is a snowfield on the east side of camp that requires a little bit of a walk. Snow is becomming scarce.
There is still plenty of snow, but you may have to walk to get to it depending on where you camp. I think the most snow is to be found on the higher side of camp (towards the summit) and on the far north side.
Camp Berlin is one of the worst camp sites I've ever seen. There is human feces and toilet paper under every small rock, garbage everywhere and the strong smell of urine in the air. You couldn't pay me to camp there. I wouldn't melt snow from anywhere near camp.
Conversely, there is no sign of litter or human waste at Calero (sp?), though it is more exposed to wind. Calero is perhaps 200ft higher than Berlin. Upon reaching Berlin, take an immediate left, follow the trail that traverses the ridge towards the black rocks near the top. I will post a picture of this camp later today, as I did not see any on SP, nor do I see any mention of the camp anywhere. I'm very happy that we decided to summit from there. There should still be ample snow available on the northeast end of camp.
Be sure to bring powdered drinks like Gatorade with you for every day. The water on Aconcagua does not have minerals in it (except for the magnesium at Confluencia). Your body does not derive much benefit from the water without the addititives.
Good luck with your expedition!