Bread can mean food: enough to eat, enough to sustain us, enough for every day, not just when we become hungry. It can mean life force: our meaning and purpose in life. It can represent the bread that Jesus gave his disciples in the evening before he died and that we receive in communion. It can mean the Christ presence in our life.
Although there are times when I am alone saying this prayer, the words aren’t only for me. Whether alone or with others, give US rolls off my tongue. Jesus must have been thinking of community. His message isn’t just for individuals; he wants us to think collectively. I love working on my own personal salvation, but that’s not point.