Apex domains cannot have CNAME records.
Question and response
Question
dig special-t-water.com. NS
Answer
special-t-water.com. 5 NS ns-1700.awsdns-20.co.uk.
special-t-water.com. 5 NS ns-599.awsdns-10.net.
special-t-water.com. 5 NS ns-571.awsdns-07.net.
special-t-water.com. 5 NS ns-1922.awsdns-48.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0