What type of diet or healthy eating should a person in the hospital recovering from sepsis take?

Varies. Depending on your overall health and other medical problems, your recommended diet will vary. Many people will have protein malnutrition after a severe illness, so in the absence of other issues this may be what you end up eating.
Dietician... Proper diet for this patient is determined by many factors including the presence of diabetes, GI problems, etc. The best person to make dietary recommendations for a hospitalized patient is the hospital dietician. Perhaps you should request this intervention for this patient.