update product_available_date in cart session

[brenee]

joomla 2.15.17   
vm  2.0.26d

I display product_availability and product_available_date in my default_pricelist.php.  I need these values AND product_name to update from the product databases within my cart, not the product's vm cart session because it can change frequently.

What do I need to change within the cart helper to achieve this?