I am Doctor Thomas, double board certified doctor in internal medicine and integrative medicine. I am a clinician of over 20 years experience. I will start by asking you a question or by giving you an answer based on your information provided so far. I will be here to follow up with any further questions or concerns you might have.
Normal individuals do not get dehydrated to the point .they obtain muscle twitching. This would require a medical problem to happen, and you have given no indication that you are dehydrated.
There is a syndrome called benign fasiculations, which usually resolves itself. However, you do not meet the full criteria for this.
Potassium depletion is not common without illness, it is in almost all vegetable foods. Magnesium deficiency [relative] is far more common, but all electrolytes should be checked.
Twitching can come and go in the early stages of more serious illness such as lyme disease, ALS and MS, so any new onset of muscle twitching is a reason to talk to your doctor, not simply wait and see if it goes away as you were advised.
I would see the doctor, have routine labs, plus magnesium, calcium and thyroid studies.
Use reply to let me know if you have further questions [click reply to expert].
Please do not forget a positive rating [hopefully you will click an excellent; or come back to ask me more as needed].