How much spending money should I budget?
Some volunteers manage to get by without spending much while others can spend $15-30 per day on extras. These extras might include socializing with other volunteers and locals, buying snacks and souvenirs, eating at cafes or restaurants, transport and weekend travel etc. Ultimately it depends on the person, but we usually suggest budgeting around $20- 25 per day on personal expenses.
You could also check the below websites which might help with your budget. http://www.numbeo.com/cost-of-living/ and http://www.budgetyourtrip.com/