The term "Shower Bottle JM-15" is likely an internal product code for a generic item, similar to other codes beginning with "JM-" that are found in various regional online markets and from wholesale manufacturers. It does not appear to be a globally recognized brand name.

The most probable products associated with a "JM" and a number in this context are:

A Refillable Spray Bottle: The initials "JM" are associated with manufacturers of spray pumps and various plastic sprayer bottles, such as a large pressure sprayer model from the brand Jaya Mata (JM15 Pressure Sprayer 8L) or general plastic sprayer bottles from Zhejiang JM Industry Co., Ltd (e.g., Plastic Sprayer Bottle (JM151(PE))).

A Generic Refillable Toiletry Container: The general category "Shower Bottle" often refers to refillable pump bottles (usually around 15oz or 500ml) for shampoo, conditioner, and body wash, particularly from sellers in various international marketplaces.