Tony, Like everyone is saying. £100 is way too little!
I went for 3 weeks and spent about £1200 overall, granted I did overspend in some areas, but I also budgeted when I could. I think the lowest I ever spent was about 300 pesos in a day, which is about £4.40 ish in todays prices. But that was just my food for that day. When other expenses came to play it would be difficult to imagine living on less than 1000 pesos a day.
I would suggest saving up a bit longer if possible or taking a credit card if you have one, worry about repayments when you get back.
Oh, really, do not forget the sunblock!
