Is it possible to drink alcohol on $20 a day?

No. A single beer in a bar costs $2.50 to $4.00, which will instantly break your budget. If you want to stay under $20, you must stay sober.

How do I move between cities cheaply?

Use the state railway third-class seats. They are fan-cooled and hard-seated, but you can travel halfway across the country for under $5.

Is $20 a day sustainable for a long trip?

It is physically possible but mentally taxing. Expect to feel tired and sweaty, as you will be using public transport and walking significantly more than the average tourist.

Thailand on a $20 Daily Budget

To survive on $20 a day in Thailand, you must stick to street food, utilize local buses or trains, and book dorm beds in hostels outside of major tourist centers. Avoid alcohol, private taxis, and western-style restaurants entirely.

Choose your location wisely. Avoid Phuket, Koh Samui, and central Bangkok. Head north to Chiang Mai or Chiang Rai, or explore smaller provincial towns like Phitsanulok where a dorm bed costs $6-8 instead of $15-20.
Master the street food economy. Eat exclusively at local night markets. A plate of Pad Thai or Khao Pad (fried rice) costs $1.50 to $2.00. Drink bottled water or filtered water refills from machines ($0.03) rather than buying convenience store drinks.
Use public transport only. Ditch Grab and Taxis. Use the local songthaew (shared red trucks) for $0.30-$0.60 per ride or third-class train carriages for cross-country travel. For long distances, take the government-run overnight buses.
Prioritize free activities. Visit free temples (wats) rather than paid attractions. Spend your afternoons in public parks or exploring walking streets. Hiking and exploring local markets require zero entry fees.

Is it possible to drink alcohol on $20 a day?: No. A single beer in a bar costs $2.50 to $4.00, which will instantly break your budget. If you want to stay under $20, you must stay sober.
How do I move between cities cheaply?: Use the state railway third-class seats. They are fan-cooled and hard-seated, but you can travel halfway across the country for under $5.
Is $20 a day sustainable for a long trip?: It is physically possible but mentally taxing. Expect to feel tired and sweaty, as you will be using public transport and walking significantly more than the average tourist.