Sir, I M Having Abdominal TB ,,Doctor Prescribed 1) ETHAMBUTOL

sir, I m having Abdominal TB ,,Doctor prescribed 1) ETHAMBUTOL 800MG 2)PYRAZINAMIDE 1.5gm 3) benadon 20mg 4) RIFAMPICIN 500MG ...All I have to take OD (Once in a day)

1) Please suggest should I take all these before meal or after meal
2) and for how many months I have to take these medicine
3) What I should not eat and Drink
4) IT can be spread to other people also...what precaution to be taken

Regards,