In this tutorial, we learn how to speak English: The glottal stop in place of the true T. When you are saying a word like "fountain" you are using a word that has a glottal stop. If you can say two common expressions "uh-oh" and "uh-uh", then you can make a glottal stop. You need to use your throat to make this sound, it's like holding your breath but using the back of your throat to do it. Try to break the word "fountain" into two different parts so you can hear the different in your voice and make the glottal stop obvious. Try doing this with different words, then you will become more familiar with this and will have more ease saying other words with glottal stops.