Unable to eat and drink water for 15 day

My father was covid 19 positive on 18 may now he is discharged from hospital and completed his 1 week isolation but he is unable to eat anything even water drop for 15, he saying that if he trying eat something mucas production started and unable to eat just he split mucas all  days now he is very weak all report and xary are ok .  ent specialist of apollo hospital delhi says it take 5 weeks, he is hardly take medicine sometimes water comes from nose like phanda . No sore throat,  no breathing,  no fever no cold , all report are clear, but problem  is that he unable to take  food or water . Dr and hospital  refuse him due to Corona positive  but now he is completed self corantine after discharged hospital and apollo refuse to Corona  test again. How can I feed my father please suggest  .