I have a 1000l IBC and its been in a year now and been good. Ok doesn't last long which is a problem. Last year I got a 4ft tree fern which is my baby, Im thinking of just using the rain water from the IBC just for the tree fern and tap for everything else. least this way it will last a little longer. As much as I want to install more water storage costs v how long I hope to be at this house doesn't allow me. Am I right to just water the large potted tree fern with rain water or will tap water be ok on the fern?