I keep it simple and just use a dash of a good quality infused olive oil from here:
https://olivadivita.com/olive-oils/fused-infused-olive-oils/ or you can get it at any olive oiler.
Then I just add dash of balsamic I like the darks for salad dressings:
https://olivadivita.com/vinegars/dark-balsamic-vinegars/
They're not cheap but I don't use a lot of it. And it is on "my list" to learn to make my own. However, the "list" is a bit long right now.