Truly, it can be pleasant to drink a glass of cold water at the end of a meal, and in some hot climate countries water is always served with ice.
However, cold water solidifies the fat you just ingested. This weakens and slows the digestion process down. When the bolus reacts with stomach acid, it is broken down, liquefied and absorbed by the intestines. Solidified fat, however, is not absorbed and remains on the intestinal walls, which can cause many unpleasant ailments, and cancer.
It is therefore advisable to drink warm or hot liquids during and after a meal.
Note: The Chinese and the Japanese drink hot tea during meals and between meals, not cold water.