Rachel Bilson's Must Haves: From a Flavored Lip Balm to a Jalapeño Tequila

While Bilson notes that her go-to 21Seeds Cucumber Jalapeño Tequila ($33) might not be a "bank-breaking item," she does consider it to be an essential — especially for avid cocktail drinkers. "[It's] a great investment for anyone's bar cart," she explains.

Pro Tip: There are so many different ways to enjoy this tequila, but Bilson prefers to stick to the classics, saying: "After a long day, it's great to mix up a quick and easy cocktail with 21Seeds Cucumber Jalapeño, lime juice, and simple syrup." Pour it over some ice with a salt rim to match, and you've got the ultimate summer drink.