You should aim to purchase the equipment you need that fits you, is comfortable, and is suitable for your environment and training level. You can buy a full set of equipment on a budget or spend more on the best life-support equipment you can get.
At the very least, you should get your own mask, fins, snorkel, and rash guard. These are easy to travel with, will not break your budget, and can be used for snorkeling sessions when you are not diving. Your mask is like a pair of shoes. It forms to fit your face over time and gets more comfortable, meaning you will always have a correct fitting mask once you have your own.