While ice is crucial, you'll also need a tall glass (like a Collins glass), a jigger or measuring spoons for accurate liquid proportions, and a long spoon or stirrer. A citrus juicer will be very helpful for fresh lemon juice, which is recommended for the best flavor.

The key is balancing the gin, lemon juice, and simple syrup to your preference. If too sweet, add a bit more lemon juice; if too sour, a touch more simple syrup. To avoid it being watered down, use plenty of fresh ice and stir gently, rather than excessively.

Freshly squeezed lemon juice will always yield the best, brightest flavor for a Tom Collins, so it's highly recommended. For simple syrup, you can use store-bought or make your own by dissolving sugar in hot water. While bottled lemon juice can be a quick substitute, it may alter the taste profile.

To save time, prepare your ingredients in advance. Pre-squeeze your lemon juice and have your simple syrup ready. You can also pre-measure the gin, lemon juice, and simple syrup into a pitcher for quicker assembly when making several drinks, adding club soda just before serving.