hey bud you have done good with it im suprised u didnt cut a bit of the fan to get the return pipe through anyway with that washer bottle turn it 180degree and get 2 30cm by 3cm peace of alloy,
put a 5mm holes on each end of the brackets and use nuts now you'll have 1 bolted under the battery tray and the other on the side of the flare and thats your support for the washer bottle
and your bumber will fit.