Is it safe to eat at markets?

Yes, look for stalls with high turnover and many locals eating there. If the food is cooked fresh in front of you, it is usually safe.

Can I really do Machu Picchu for under $30?

Not on the day you visit the site due to the high entry fee. Budget for the high cost of the site ($45+) by eating for $15/day for the three days leading up to it.

How to backpack Peru for under $30 a day

To stay under $30 a day in Peru, you must stick to public bus travel, eat at local 'menu' restaurants, and sleep in hostel dorms. Avoid tourist trains and guided tours booked in advance, choosing instead to handle logistics locally.

Master the 'Menú' culture. Lunch is your cheapest meal. Look for signs saying 'Menú del día' which offer a soup, a main course, and a drink for 10-15 Soles ($2.50-$4). Eat your largest meal at noon.
Use public bus networks. Skip the 'tourist buses' like Peru Hop. Use Cruz del Sur or Tepsa for long hauls, or smaller local bus companies for shorter distances. Buy tickets directly at the terminal 2 hours before departure to get the lowest price.
Sleep in high-rated hostel dorms. Book beds in 8-10 person dorms. Use apps like Hostelworld to find places under $8/night. Always choose hostels with free breakfast and a guest kitchen so you can prepare your own dinner.
DIY your treks and tours. Don't book Machu Picchu or mountain treks online. Wait until you are in Cusco to compare local operators. You can save 30-40% by booking in person at offices near the Plaza de Armas.

Is it safe to eat at markets?: Yes, look for stalls with high turnover and many locals eating there. If the food is cooked fresh in front of you, it is usually safe.
Can I really do Machu Picchu for under $30?: Not on the day you visit the site due to the high entry fee. Budget for the high cost of the site ($45+) by eating for $15/day for the three days leading up to it.