That's the challenge World Vision is asking people in affluent countries to take up as part of the Global Poverty Project's 2013 Live Below the Line campaign.
The campaign, which has the support of high profile figures like Ben Affleck, is challenging people to eat and drink on £1 a day for five days.
£1 a day is the extreme poverty threshold around 1.4 billion people worldwide are currently living under.
At the heart of the campaign is the idea that to eradicate extreme poverty, it must be understood.
Mathew Neville, Public Engagement Director at World Vision is taking part in the challenge with his wife and three children.
He has visited Bangladesh and the Democratic Republic of Congo where he has witnessed firsthand how hard it is for people who don't know where their next meal is coming from.
He said: "Live Below the Line gives people a unique glimpse in to the lives of those living on even less than £1 a day.
"For many of us it will be tough to feed ourselves on just £1 a day but in the developing world that money must pay for everything – food, water, healthcare, education, clothing – everything."
He added: "I'm sure I'll appreciate their difficulties even more after completing Live Below the Line."
Chefs including Hugh Fearnley-Whittingstall and Jean Christophe-Novelli have come up with recipes that fit within the budget of £1 a day - or 33p a portion.
The recipes are on Live Below the Line's online recipe book, hosted on their Facebook page -http://www.facebook.com/LBLuk
Stephen Brown, UK Campaign Manager, Global Poverty Project, said: "There is no experience like Live Below the Line.
"It really helps you understand the issues of extreme poverty. You appreciate the difficult challenges that those living in poverty have to face every day.
"For those living in extreme poverty, it's not the choice between brown or white rice, but often the choice between food or lifesaving healthcare for your loved ones."