A budget of around $50 to $100 per day is a good starting point, but this can increase or decrease depending on your specific needs and preferences. This budget can cover your daily expenses, such as accommodation, food, transportation, and activities, but keep in mind that prices in major cities like Rio de Janeiro and São Paulo can be higher. If you plan on visiting more expensive tourist destinations, such as the Amazon Rainforest, you may need to set aside a larger budget.