Price comparison site Idealo revealed the data, broken down below by month throughout 2013. The prices below are not average RRPs, but rather the average minimum price (including VAT) from online retailers listed on Idealo - both for the overall price, and price per GB.
Ginger is still used as an alternative medicine to treat nausea and vomiting; ginger ale, although it no longer contains much, if any, real ginger, was originally used for this reason to quiet stomach upset. However, if taken in large quantities, ginger can cause other stomach problems such as diarrhea.
Alcohol can affect your cells' ability to absorb water, leading to dehydration, which is already a concern for someone with diarrhea. Caffeine, found in coffee, tea, chocolate, and some energy drinks, is a stimulant that can speed digestion and cause diarrhea.