Thought to share with you for your Italy trip planning (all in US dollars):
Eat a Light Breakfast
If you're used to big breakfasts at home, you'll probably need to be a little flexible in Italy. This is because a typical Italian breakfast involves just a hot coffee drink of some sort (usually either espresso or a latte) and a pastry, a meal that shouldn't cost more than $4 or $5. Just be sure that when you do eat breakfast, you do so standing up at the counter as most Italians do. Otherwise, if you sit down, the price of your breakfast will double or even triple with table service. Pick up some fruit or other healthy snacks from local food shops or markets to tide you over until lunch.
Pack a Picnic for Lunch
Lunch in Italy is also usually a simple and inexpensive affair, even if you go out to a restaurant. For a mid-range restaurant meal, you shouldn't expect to pay more than $15 or $20. And if you're eating at a deli or sandwich shop, the cost of your lunch isn't likely to exceed $10. Outdoor markets are your best bet for the cheapest meal. Keep in mind that low food prices don't indicate low quality in Italy. Unlike in some other countries, cheap options like street food, panini sandwiches and fresh market meals are often the most delicious.
Indulge in a Three-Course Dinner
No matter what type of restaurant you choose for dinner, expect a three-course meal to last for hours and to cost anywhere from $20 to $50 per person, depending on how fancy the establishment is. Keep in mind that the tip is generally included in restaurants; if it's not, 10 percent is plenty.
If You're Eating on a Budget
Just because you're backpacking on a budget doesn't mean you have to skimp on eating delicious food. You are in Italy, after all. Follow a few simple tips to keep from spending too much: First, pack picnics when and where possible. Food in local grocery stores and markets is cheap and fresh; plus you'll have the option of sampling lots of different local specialties. Skip the dessert menu at dinner and go for local gelato instead; a cup usually costs around $2 or $3. Finally, if you're drinking alcohol, opt for the house wine instead of picking a random bottle from the wine list. House wine in Italy typically costs only around $10 or $15, depending on the quantity, and it's usually a very tasty option.
Other: Your largest part of budget will go to gas if you rent a car. Traveling with train is very affordable and super nice and comfortable. Also book ahead attraction you'd like to visit, if you don’t want to spend 2-3 hours in the line.