EMERGENCY COVER KIT
1) 3.6 x 3.0 METRE TARPAULIN - Various purposes see below.
2) 2.0 x 2.0 METRE FLOATING BUBBLE COVER - ****This will fit a majority of hot tub water-lines - BUT measure your own water-line to be sure. It can easily be cut to shape with a craft knife or sharp scissors.The cover should vastly reduce the loss of heat by evaporation. This cam be used once a new cover arrives to reduce running costs further.
You may need to supplement this 'kit' with some batons of wood or similar to support the tarpaulin if you don't have an existing hard cover of any description. If you do have an old cover that is falling apart or you feel it is contaminating the water - use the tarpaulin as a barrier layer between the tub water and the cover.