use cordial perhaps, or mix it with a cheap beer. I don't know if white cider + beer counts as snakebite, but it does taste much better anyway. Or, you could be a real man and drink it straight.
Be warned though, the glory days of £1= 7.5 units are long gone. In some supermarkets (morrisons) it's cheaper (per unit) to drink their high strength regular cider, which arguably tastes worse, than it is to drink white cider.