Which sun cream after a spray tan?

[pandorawithtreaclecolouredhair]

I know it's advisable to not use oil-based moisturisers after a spray tan, to help it last longer, and have ordered a Fake Bake moisturiser.
But what sun protection cream can I buy to take on holiday that is oil-free?

Bumping for ideas, anyone?

I use Aldi's own brand. Was away last month, had a spray tan done beforehand and used that for the week. It'll start to fade anyway after a few days but obviously anything oil based will remove it a lot faster.