Now I have been in Indonesia an couple of times and I figured out of what you can eating etc.
1: You should be drinking tabulated water. Do not drink the tap water, Indonesian are not drinking it either.
2: If the food is coming directly from the kitchen then it’s okay to eat. I have been eating at street food places and so far I have not had any problems.
3: Ice cream is fine.
4. In Indonesia there is a tradition to store food outside over the night or so. For trained stomachs it’s maybe fine, but for me that is living in Korea, I can’t make it. I have got food poisoning 2 times, so that should be avoided.
Now I’m avoiding that cold food and since then I’m fine of eating everything else.