The sounds for COFFEE in Chinese Mandarin is quite close to the English sounds for coffee.
We use two Soundsters to remember to Chinese Mandarin sounds for COFFEE.
caSTLE to remember the the sound for “kar”.
You get the “kar” sound by pronouncing the ca part of the word caSTLE, and keeping the STLE part of the word silent.
faiNTING to remember the sound for “fei”.
You get the “fei” sound by pronouncing the fai part of the word faiNTING, and keeping the NTING part of the word silent.
And when we put these two sounds together, we get “kar fei”, which means doctor.
You can easily remember that “kar fei” is the sounds for COFFEE by remembering the image of caSTLE is having a faiNTING spell over a cup of coffee.
And for this phrase, you do not need to be very accurate in your tones because as long as you are saying this phrase in the right context, like when you are ordering a cup of coffee, you will not be misunderstood.
And if you want two cups of coffee and have not remembered how to say TWO, you just need to raise two fingers to show that you want two cups of coffee.
Just go and start using what you have learned.
Enjoy.

