Thanks for writing your query.
After reading your post, it seems that your father is having urinary tract infection
along with loose stools.
You should get following investigations done :-
1. Complete Blood Count
2. Urine examination (Routine/Microscopic and culture/senstivity).
3. Stool examination.
You can take your father to the ER for clinical examination.
Antibiotic like Ciprofloxacin
500 mg twice a day along with antiamoebic like metronidazole
400 mg thrice a day can be taken along with a probiotic
He should be adviced to drink plenty of water daily.
Treatment can be planned according to the reports of the investigations.
I hope this is helpful to you.