Because the food travels though it
Your answer is...
A.) You relax some of your requirements.
Both sides of the conflict need to sacrifice some of their values to find a compromise that both sides can reach and be happy with.
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Because water will flush the stone to the urinary tract.
Water can push the stone and lubricate the way, make the passage easier. The water can also dissolve some stone, make it smaller. Stone is made because the water content is too low and make the concentration of solute become higher, make it easier to precipitate. An acid/base pH water would dissolve the stone easier, depends on the stone composition.