February 22, 201411 yr I buy flavoured water (1 litre) for 49p (and they're always on 4 for £1.50, for £1.50 for 4 litres), where a small tin of soda is 85p, standard 2 litre bottle of soda is between £1-2 (certain bottles are put on sale for £1 but usually RRP is £2). Also plain water (with no flavouring, 2 litres) is available from as low as 17p.