Upvote:1
This is Indonesian's standard, which I think is quite similar to those 3 countries. For (decent) foods and drinks, I would say 5€/day. Beer costs around 1€. Accomodation starts from 5€/day, but for tourists from Europe/America, it is advisable to take a more expensive room which may cost around 10-15€. As to transportation between countries, I cannot tell as it depends from what kind of transportation and what your start and destination points are. You can start making your itineraries and come back with a more detailed question. My advise is to bring your bank card with you. I personally would not bring a lot of cash in my wallet during traveling.