Put in colored glass with plastic polycone lid. Store in cool dark place. Refrigeration may or may not be beneficial, but I don't think it is the standard recommendation. Should last at least 1 year.
I am disappointed Capella is now selling 1oz flavors in plastic rather than glass and last time I was on their page, all their pictures showed glass bottles and stated larger quantities come in plastic.
I don't care how safe anyone claims plastic is, I will never believe it and avoid it in all forms when ever possible. Especially Chinese plastic.