For your 4 questions answers in detail consult directly.
Drinking plenty of water is not correct according Ayurved
Dhaniya water may goes wrong in some condition.
Answer for other questions need basic information from your side.
Next Steps
take online consultation directly providing all details
Health Tips
http://aayurvedatunaarogyakade.blogspot.com/2018/03/blog-post_12.html?m=1
read this article for water intake answer.