Any ways to improve stuttering on certain words?

Any ways to improve stuttering on certain words? I always stutter on the M of the word “minutes” which I actually have to say a lot at my job when referring to time. I also always stutter on the W of the word “water”. I can say these words a million times fluently when I’m by my self but the moment I’m talking to someone I can’t get the word out. Any tips to help?