Extra steps to make the plugin work:
Add below lines to WordPress' .htaccess. ---> This step is totally no longer needed.
RewriteCond %{REQUEST_URI} /m/water-quality/$
RewriteRule ^m/water-quality/(.*)$ wp-admin/admin-ajax.php?action=cura_mobile&%{QUERY_STRING} [NC,L]
RewriteCond %{REQUEST_URI} /water-quality/.*$
RewriteRule (?:^|/)water-quality/(.+)$ wp-admin/admin-ajax.php?action=cura_$1&%{QUERY_STRING} [NC,L]
And insert them to right place
RewriteRule ^index\.php$ - [L]
# above lines should be probably here
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [L]