This can make travelling tricky, since you won’t have anywhere to store the formula, however, there are ways to get around this.
One option is to buy one of the instant formula’s that are available, and decant this into your baby’s bottle when needed. Another is to travel with a flask of hot, boiled water that is warmer than 70 degrees Celsius, and use that to prepare your baby’s bottles. Water needs to remain warm so that it kills any bacteria that may form over time.
A bottle warmer can help to warm formula if your baby does not drink milk at room temperature, or you might need to find running water to cool down a freshly made bottle that you’ve used hot water to make.
All of these precautions are aimed at preventing the growth of bacteria, and are essential to your baby’s health.