Beyond your pisco, lime juice, simple syrup, and egg white, you'll definitely need a cocktail shaker (ideally a two-piece Boston or Cobbler shaker), a jigger for precise measurements, and a hawthorne or julep strainer. A citrus juicer is also highly recommended for fresh lime juice, which is crucial for the drink's quality.

Using fresh, high-quality, pasteurized eggs significantly minimizes any food safety risks associated with raw egg whites. If you're still concerned, you can opt for liquid pasteurized egg whites from a carton or explore using aquafaba (the liquid from a can of chickpeas) as a vegan alternative to achieve a similar foamy texture.

The initial investment will be for a good bottle of pisco (around $25-40) and Angostura bitters ($10-20), plus basic bar tools if you don't have them. Once you have these staples, the cost per cocktail is quite low, primarily for fresh limes and a few cents for an egg, making it much more affordable than buying them at a bar.

The key to a good foam is a thorough 'dry shake' – shaking all ingredients without ice for 15-20 seconds to emulsify the egg white. Use very fresh egg whites, as older eggs don't foam as well. After the dry shake, add plenty of ice for the 'wet shake' to chill and further set the foam.