Going away need help?

im going away soon for 2 weeks and i was just wondering if there is anything i can do to my tank that will keep it in the safe zone ie ph and nitrates. And what will be better asking a friend to feed them or getting a automatic feeder? Its a 63 litre tank with a betta, glow lights tetras, 2 snails, red eye tetras, x ray tetra, black phantom tetras, white tip tetras, and 2 small algae eaters. In the next couple of weeks will have a frog. And have got a selection of live plants