Hi Dakota,
My son did six weeks of EN to induce remission. He was just about 17 when he did it as well. He used Tolerex, instead of modulen, and, as it's not drinkable, he used an ng tube at night (would insert it himself before bed and remove in the morning).
As he had all his nutrition overnight, he was allowed clear fluids during the day - broth, freezies, gatorade, clear pop, etc. While he was in school, we arranged with the school to keep freezies on hand for him and I sent him some broth for lunch. This allowed him to sit with his friends and, at least, have something to sip on. If you are allowed broth, this seemed to be a big help to him - it gave him something warm and had a savoury, 'meal-type' flavour (a change from the other 'sweets' he was allowed). Distraction was also imporant!
As far as what to tell his friends... he really just told them the basics, said that he had inflammation in his intestines and the formula would clear it up. He was actually very open about it and his friends were all really supportive.
It certainly isn't easy but it helped my son quite a bit! It took him into clinical remission and his symptoms were gone very quickly. Aside from taking some time to rebuild strength, weight, etc., he was back to his regular lifestyle within 3 or so weeks.
Sorry, I've gtg now but, good luck and let me know if you have any more questions.
:ghug: