Live (from) hand to mouth
"The Lepido family, she informed Dom, lived hand to mouth in a rundown old property they couldn't buy because the bank kept refusing them the loan." ("Watercolours")
to live (from) hand to mouth - to have just enough money to live on and nothing extra
My father earned very little and there were four of us kids so we lived from hand to mouth. (Cambridge Idioms Dictionary)
"The world was a fantastic, marvelous, awesome place, Rose decided."