Apex domains cannot have CNAME records.
Question and response
Question
dig watermeisters.com. NS
Answer
watermeisters.com. 5 NS ns-1844.awsdns-38.co.uk.
watermeisters.com. 5 NS ns-239.awsdns-29.com.
watermeisters.com. 5 NS ns-992.awsdns-60.net.
watermeisters.com. 5 NS ns-1166.awsdns-17.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0