Water makes up the vast majority of your body and most of the foods you eat. If you have associated drinking water with a reaction, most likely this is due to some chemical in the water. This could be a chemical that is intentionally added to the water such as a purifier. It could also be a chemical that is unintentionally added such as a pesticide. If you drink bottled water and only get reactions on infrequent occasions, it is most likely not related to the water, but to some other factor. I would suggest seeing a board certified allergist to evaluate the many causes of the symptoms you have described. This specialist would be able to help you find if there are any identifiable causes, which may have nothing to do with allergy. If there are no easily identified causes, then the cause is labeled idiopathic. This is another way of saying that the cause is unknown.
If you are having swelling that effects your breathing in any way, the EpiPen® (epinephrine) Auto-Injector may save your life. Keep in mind that it must be given early.
good luck