Hello Karen and a huge welcome.
We use lemon juice and cold pressed olive oil......... we like the fruity one from Aldi.
Good luck with your journey
cheers
Freda

Hello Margaret
Two tablespoons of olive oil............we use the Aldi fruity one
One tablespoon of either lemon juice or red or white vinegar
Half a teaspoon of Dijon mustard
Salt and pepper to taste.

We make ours up each time we have salad and have never stored it in the fridge. Olive oil goes solid in the fridge and I don't know how long it would last if made of lemon juice.

cheers
Freda