Eating out is actually cheaper than buying and cooking your own food in Indonesia, especially when it comes to street food. Street food is delicious and very affordable, with meals starting from a few dollars. Traditional Indonesian breakfasts are also a great option, being heavy and filling while costing between a few dollars.
Western food is more expensive than local food, so try to stick to Indonesian cuisine. Some meals in Indonesia are quite large, so consider sharing with fellow travelers. Also, alcohol is expensive in Indonesia, so it's best to avoid it or drink in moderation.
Additionally, consider eating at local markets or food courts, where you can find a variety of affordable options. Avoid eating at touristy areas or hotels, as the prices tend to be higher. By following these tips, you can save money on food and enjoy the delicious local cuisine that Indonesia has to offer!