We spent less than $15/day on food (breakfast was complimentary at our hotel - Nyuh Ubud Bali Resort & Spa). Some restaurants are more expensive than others but overall relatively cheap. (If you are with a couple friends, I highly recommend you all order separate dishes and then share!) We ordered dinner at our resort each night and it was less than $10/person each night.
Tourist attractions never cost more than $3/person (except for Bali Swing which was $35USD)
Transportation is very cheap (less than $2 for 20 minute rides) and the most expensive is for 10 hour day tours: 400,000-600,000IDR is usually normal (we always tipped)
Scooter rentals are about $5-$7/day and gas is cheap.
Shopping in the markets is not expensive but it also depends on how much you want to buy
Cold bottled water is less than $1
Everything is more expensive
Food in cafes are almost double the price than Ubud (but still cheaper than North American cafes!) Food can cost anywhere from $5-$20 a plate.
Cocktails can cost up to $10-$14
Transportation is a little bit more expensive but not by much
Shopping is not cheap whatsoever! Most shops are boutique shops with very high prices! Shops similar to those in Ubud Market are also more expensive.