The weather of Boracay is hot, there are only two seasons, dry and rainy season.
You can bring your container to buy coconut juice than you don't need to hold a heavy coconut shell. Even it's tasty, but remember not to drink too much coconut juice in one day. It might cause you diarrhea.
If you buy lots of coconut juice at one time, remember to put it in a refrigerator otherwise, it will be fermented because of the hot temperature.