Highly recommend a sing-a-long while trekking. You may be completely out of breath, but it is worth it.
The food was excellent and plentiful, snacks were only needed when meal times had extended times between them. The trail is beautiful, and the views from the passes can't be duplicated.
If you change your passport number, be sure to check all the tickets as one person had one of three not changed. Information about where to get water, snacks, and tasty adult beverages is given on the trek, so ask about these beforehand.
We were able to get them up until the second stop on day 2, and then we were provided a decent amount of cooled boiled water on days 3 and 4. Ask for Juana and Raul, or Juan Carlos next year.