Anything exposed to the internet will get probed by malicious traffic looking for vulnerabilities. Best thing you can do is to lock down your server.

Here's what I usually do:

• Install and configure fail2ban
• Configure SSH to only allow SSH keys
• Configure a firewall to only allow access to public services, if a service only needs to be accessible by you then whitelist your own IP. Alternatively install a VPN

Anything classified as drinking water in Sweden is protected by the same laws as foods. Caveat there is that warm tap water isn't classified as drinking water, and as such isn't recommended for consumption.

Can have a strong mineral flavor in the countryside as well, but should still be perfectly safe to drink.