Accommodation costs can vary in Indonesia depending on the area you’re staying. But typically a hostel dorm bed is $5-15 USD per night, many on the higher end of the spectrum. A private room in a homestay, hotel or Aibnb could be anywhere from $15 – 50 USD per night, and renting an entire villa or apartment $50-300 USD per night.
Food from warungs (a locally run food place) can be only a few dollars and as few as $1 USD. Food from typical restaurants is around $5 USD, but going to the more western/high end restaurants can be $6-12 USD.
Flights between islands vary in price, but a a flight between Bali and Lombok is typically $20 USD.
Ferries and speedboats vary in price; a speedboat from Bai – Lombok is $16-25 USD while a speedboat to Nusa Penida is about $7 -12 USD.
A private driver in a car can vary in price, typically starting at $4-7 USD for a one way trip somewhere and $20 – 35 USD for all day touring.
Renting a motorbike in Indonesia can be from $5-7 USD.
As a budget backpacker, I would budget at least $40 per day in Indonesia. If you plan on splurging more especially in Bali, then you will need more. It’s also possible to spend less if one tries.
As a solo traveler, I would say I spent much more in Indonesia than a pair of people would because there was no public transportation therefore I had to pay for a private driver on my own many times.
International credit cards may be accepted in parts of touristy areas in Bali at higher end restaurants. Otherwise, paying in cash is required, especially for drivers, local warungs, hostels, and remote areas. If traveling to a more remote area or smaller island, it’s a good idea to bring enough cash in case the ATM there does not work.