Thanks for your query,
You are doing excellent management.of your child.
Diarrhea is mostly viral in nature and takes few days to settle.
Continue with oral rehydration solution sip by sip after each stool,BRAT diet
Add zinc for 14 days.
Also give coconut water,lemonade.butter milk.
For raw bottom,keep area dry,pat gently at time of cleaning and apply caladryl lotion 3 to 4 times a day.
Observe for any features of dehydration
In case symptoms persist get him evaluated by pediatrician
Wishing your child good health.