Cambodia

If you want to rough it, a month in Cambodia may be had for about $1000. Food and drink, like dorms, are fairly basic yet can be very inexpensive. You'll also need some negotiating abilities to avoid being overcharged by the Tuk Tuk drivers. There will be some one-time costs, like as the $62 3-day pass to Angkor Wat and diving tours, but there will also be days when riding a bicycle through a little village and eating inexpensive and wonderful pork skewers will stretch a dollar or two quite far.

Another option is to look at booking.com's beautiful, largely new boutique hotels. They are clearly more expensive than staying in hostels, but they are well worth the money!

Price: $25/ day
Meals: $5 – $10/ day. Breakfast is available at certain hostels.
Accommodation: $3-$10/ night in a hostel
Transportation: $6-$15 for a motorbike for the day (Prices may vary based on the condition of the bike and your bargaining skills) or for an intercity bus ticket
SIM card with data: $2 for 1.5GB with 30-day validity. Yes, it is that cheap!