Majorly depends upon the way you reach Goa. If you are travelling with your own vehicle then you may save some money, or else you'll have to pay for the rented bike/cars. Food is something which is totally up to you, you may get cheap and actually great deals. I have just been to Goa. I stayed for 6 days and spent around 6k which is apprx 1k per day. I guess same might apply to you. P S - minor give and take keep in mind
Goa trip cost depends on how you want to enjoy your vacation, places of stay, travel mode within the city. Budget travelers can go for bike-on-hire option or Cars-on-hire. North Goa tour packages can cost you a bit higher than South Goa tour packages.
Overall, for budget travelers, Goa tour packages can range from Rs. 1000 - Rs. 1500 per day which includes stay, food, and commuting. For those looking for luxurious Goa tour packages, there is no limit! https://www.tripoto.com/goa/tour-packages