4 days and 3 nights Budget DIY Itinerary in Boracay

I'm taking a personal challenge with this trip and even trying to prove to my friends that P10,000 is too much for a 4 days and 3 nights all-in vacation in Boracay. A lot of people I knew told me that P20,000 is not enough to suffice your stay in Boracay. They even added that food and water activities and even accommodation were lavishly priced and not reasonable. Hmmmmmm.