I try to make sure I don't spend more than $20 a day. That's for groceries, household needs, gas, entertainment, bday presents, even doctor's visits (our copay is $15). If my son gets sick and I have to take him to the doc that day, I only have $5 to spend for the rest of the day. Obviously, emergencies aren't included in this.
So, its all in the planning and sacrificing for me but its worth it. It takes a lot of discipline to build up to $20/day. When I started out, I was spending on average $75 a day. We are only a family of 3 so its easy to stay within this daily budget and in the end, we can afford quick weekend getaways or splurge on a new fridge if we wanted.
gl!