Well done on starting to refeed! I know it is very hard, but if you stick with it, it will get easier and you will have your dear grandson back.
We have 3 meals and 3 snacks (breakfast 7am, morning tea: 10:30am, lunch 12:30pm, afternoon tea 3:30pm, dinner 5:30pm and supper 8:30pm). You can do it with 3 meals and 2 snacks and Kartini clinic has 3 meals and 1 snack, I've attached their meal plan for you.
If you were able to have a snack after dinner last night, I would continue with it. It will be all tears the first week or so, but afterwards it will be easier and he will be able to finish it in under 20 minutes. Also the snack after dinner (supper) goes straight to weight gain :-)
We had a very hard time just getting d to the table and eat. She could not eat with the rest of the family and had her meals in her room with me supervising. She also struggled with a sandwich and was only able to take a very small bite the first week. After another week she was able to have a quarter, then a half and so on until she was able to eat a whole sandwich. The deficit was usually made up by taking an Ensure Plus.
It took my d 7 weeks to be able to follow the mealplan. At the very beginning, we just tried to get more in her than before and to get her in the habit of having meals again (she only had breakfast), even if it just means sitting there and taking a single bite or sip. It is very hard on them. My d cried the whole day, but today she can't even remember those days and is living a life of a normal teenager.
My d also body checked, so I bought clothes in a size, which would fit her and one size up. After a month of weight gain I just replaced her clothes with larger sizes (labels cut off) so that her clothes fit looser and the weight gain won't be so noticeable to her.
You are already doing a great job, just keep on swimming and it will get easier!
Sending you lots of hugs!