Pick a drink with Quinine in it - read label or stick with main brand.
Best is Bitter Lemon


(Schweppes) - (Lemon juice acts as a blood thinner so boosts benefits).
Tonic water (Schweppes again) is up there too (minus the best additive before going out!!


).
So slug a bottle (300 mls) before or if you have been caught out and tender then after relieves too & stops re-occurence.
In the longer term I think Magnesium suppliments are recommended but someone should be able to fill-in a bit more.
Cheers
AP (own up who Pee'd off one of the rain gods - ahhh enough rain


).