I hold outdoor limp flowers and be wondering how to hold on to them alive when I move about on leave for a week.? I know to ask neighbors, family, etc. but I just moved within...

I know to ask neighbors, family, etc. but I just moved within and don't really know anyone or trust anyone for that matter to come into the apartment to get to the porch. Does anyone know of any self-watering things I could buy? I'd hate to love my flowers!