I actually have one of those "Good Seasons" salad dressing cruets that you use with the packets of seasoning to make it at home.
It has lines on it for vinegar, water and oil....so I'm not sure of the measurements because I just fill up to the line.
So, I pour in apple cider vinegar up to the line (because it's supposed to be a healthy vinegar that helps you lose weight....and I like the taste), water to the next line, then...instead of the seasoning packet I put in a little chopped garlic that I buy in the jar, a little salt and pepper, a little parsley, a little dried onion flakes, a little italian seasoning mix that has oregano and basil and probably more parsley
...just whatever looks right. Then extra virgin olive oil to the oil line on the cruet and shake it up.
It literally only takes a few minutes to make.
When this one runs out I'm planning on trying a mexican-ish one with a little chili pepper, some cilantro, maybe a blob of salsa lol....and use black beans and avocado in my salad instead of the white beans/chick peas I've been using.