Assuming that the water boxes in that kit are the same size as those little drink boxes that kids love, six boxes for two adults for three days is cutting it pretty thin. Those two people better not be in a hot environment, or working hard.

Personal preferance of course, but a box of milk, or choc. mild, 'specially if room temp. is the last thing I want when I am hot and dry.

If you have a good water supply, and a large enougth container, the Crystal Light powdered drinks (OJ, lemonaide, and iced tea are my favorites) make a nice addition to a grub box...