It’s anything acidic from what I have found/read, the pamphlet that comes with mine mentions it. You can get a strong and longer lasting effect if you take calcium carbonate (aka antacids) around the same time.

Short answer no, but you can add the source IP as part of the http header https://www.nginx.com/resources/wiki/start/topics/examples/forwarded/ then you have to log that bit of the header at the app level.

There can be ways of your are using ipv6, basically turning your cloud host into a router, but but ipv4 you would have to have a 1:1 mapping and setup the routing carefully to make it work.