Firstly, it’s not possible to withdraw cash once you’re in the country, so bring hard cash and bring more than you expect to spend.
Daily expenditure varies depending on souvenirs and alcohol consumption. The local currency, the nakfa, is somewhat unstable and prone to fluctuation, but prices are roughly as follows (all prices are in USD):
Water: $0.50-$1
Beer: $2
Cigarettes: $3
Meals: $5-10
Soft drinks: $1