Actress Sophia Bush got back to basics during a recent charity trip to Ethiopia after spending her travels "off the grid".

The philanthropist and former One Tree Hill star headed to Africa to raise awareness about the need to provide safe drinking water for residents in the poverty-stricken country as part of her work with the Charity: Water non-profit organisation.

She returned to her native U.S. this week (ends10May13) and logged back on to her Twitter.com blog on Friday (10May13) to share a photo of the children she had spent time with.

In the accompanying caption, she writes, "These kids now have clean water thanks to @charitywater. I just spent the last week off the grid in Ethiopia visiting with them, and many more communities. Water changes everything".