In addition to detoxing, hydration also helps to get the meth out of your system faster. Using meth causes dehydration in the body. A dehydrated body cannot flush out meth from the body as fast as a hydrated one. Water helps flush out meth through urine and sweat. In addition to water, you can try juice, coffee, or soups to hydrate the body.
The only possible downside to hydrating the body is hyponatremia. In hyponatremia, the excess amount of water intake dilutes the concentration of Sodium in the body which can lead to dizziness, muscle cramps, nausea, and even seizures in some cases. This is also possible in normal situations where drugs are not involved. In any case, drinking too much water without any consideration for food intake and the condition of the body can be harmful.