Tomorrow is my first match against St. Peters junior team and my coach told me that it will involve a tea break. I do not wish to drink tea - will this be expected or enforced during the tea break?
In cricket, "tea" refers to a break between either playing sessions or innings; it is also the name of the supplied food and drink selection at that break.
While there would generally be tea (the beverage) available to drink at tea (the break) it's not typically the only drink available, nor is drinking it compulsory.
@motosubatsu's answer is very true answer, under normal circumstances. Most games I believe that to be true.
However, upon rereading your question again, I thought of the possibility that your coach (since it appears he stressed the tea break to you, a new player) may indeed 'enforce' actual tea at the break, as a learning experience.
Don't worry overly, it's not THAT bad, at least if there is sugar and some sort of cream available. Oh, and good luck with the match!