1) Make a new "Base Color" layer with the color of your choice. Make sure its visible.
2) Select everything (Ctrl + A) and then "Copy Merged" (Ctrl + Shift + C) everything you want to be visible in the reflection.
3) Make a new layer above the already existing "Reflection".layers. Make sure that your new layer is visible and that the other "Reflection"-layers aren't. Paste your merged copy into this layer.
4) Whilst your reflection layer is active Ctrl-click the "Inner Glow"-layer. A selection should now appear. Invert it (press Ctrl + Shift + I), then press Delete. Now only the "icon" is left in your new "Reflection" layer (i.e. the background and shadows should be gone from the merged copy).
5) Flip the layer vertically (Right click -> Free transform -> Right click again -> Flip vertical).
6) Move the flipped icon down so it aligns with the main part at the bottom of the image.
7) Whilst your "Reflection"-layer is active, Ctrl-click the layer mask of one of the other "Reflection"-layers. Now you should have a new selection. Press the "Add layer mask"-button.