I reckon, if you get a 3litre bottle of water, put the lid on it, put a little hole in the top and let it hang over the plant so it slowly drips water onto it, that could work..
Plant need proper amount of sunlight, air and water so if the question of one week then we should place the plants where limited amount of light and air should be provided because they can’t water actually daily. And before going, excess amount of water should be provided.
