M.R.
Wow C., I am so, so sorry for this diagnosis for your daughter. So many of her symptoms make sense now, in hindsight. The chugging of water for instance, is so common. And she has probably been so irritable due to the imbalance of electrolytes.
What types of specialists will you be seeing now? Do you primarily see a Pediatric Nephrologist or a Peds Endocrinologist?
You should ask those departments or MDs about support groups in your area. There is usually a kidney walk every year in most big cities. If you join that group, you are bound to meet families with similar genetics and issues.
Best of luck to you and your family C. as you navigate and learn to manage this condition.