How can I show the bundle on the cart page?
You can show the bundle widget on the cart page by creating a funnel promotion in Bundler. By creating a funnel, you let the Bundler display the selected bundle in a popup on a cart page when the customer has at least one product from the bundle in the cart, but doesn't yet have all products from the bundle in the cart.
It is really amazing how these funnel promotions turned out :)
The funnel will show a popup with the bundle widget and prompt the user to add the whole bundle to the cart to get a discount.