Bromine water 2% Do-It-Yourself instructions [no longer sold as an item ] - see long item description
15578-DIY

use a Bottle, glass amber 1L  [Search 1000SU-1L ]

Tare bottle on scale and record original weight as at the end you must  make up to bottle weight plus 1000g

Work in the fume hood

Add 28g sodim bro mide [ 46208-100g ] ( rinse in with DI water ]

add 22g sodim chlo rite [ 46608-100g ] rinse in with DI water ]

make up to about 500ml with water

Add 180g of 4.9% hydro chloric acid. [ 27238-P-1L ]

Shake mix - brom ine will be forming 

Quickly make up to about  1000g

Place cap on bottle.