Portable Water Purifier Market Size, Share & Industry Analysis, By Product Type (Drink-Through Purifiers, Pump & Squeeze Purifiers, Gravity-Fed Purifiers, Batch-Treatment Purifiers, and Powered Portable Purifiers), By Technology (Physical Filtration & Adsorption, Reverse Osmosis & Nanofiltration, Ultraviolet Disinfection, and Chemical & Electrochemical Disinfection), By End User (Individual & Household, Commercial & Institutional, Government & Defense, and Humanitarian Organizations), By Distribution Channel (B2C/Retail and B2B/Direct from Manufacturers), and Regional Forecast, 2026-2034