On saving
Save a water bottle.
Save money.
Bring a water bottle. Some airports might not allow more than 100 ml of liquid so you might have to chug all the water or dump the water, but make sure to keep your water bottle. Refill when there are free water dispensers—some airports, accommodations, museums, and restaurants have free water dispensers. It can save you at least 25 Philippine pesos per half a liter.