How to pronounce nothing

It depends. The “t” in water and matter can be pronounced correctly a few different ways. Different dialects will pronounce the “t” as the the traditional letter T is pronounced /t/, but it is most commonly pronounced as an Alveolar flap , /ɾ/, and in some dialects you will here is glotallized as a Glottal stop /ʔ/.

When the T and D sounds come between two other consonant sounds, many Americans will drop them. But when we add the -ly ending, it now comes between two consonants. You’ll hear a lot of native speakers say ‘exactly‘, with no T sound. Exactly, exactly.

H is silent in many English words, for various reasons. Not all such words that have come into English from French still have a silent h, however. Over the centuries we have come to pronounce the h in words like horrible, hospital, host, human, and humour.