According to Kantar. Cristaline is the most popular bottled water in France.
L’eau préférée des français ! – Cristaline (moneaucristaline.fr)
However the Cristaline water sold in the UK by Amazon UK and B&M Stores is NOT French. it is sourced and bottled in the UK. It is cheap though, with 6 x 500ml costing just 79p at B&M.
Cristaline Still Spring Water 6 x 500ml | Food & Drink | Water – B&M (bmstores.co.uk)