I also live in a dengue and malaria zone so tend to rely on Boots Tropical Strength 50% DEET repellents. But I agree with AndBreathe that DEET has drawbacks. I need to try their homemade recipe!
However, I think it is no longer possible to buy citronella oil over the counter in UK (pharmacies now banned from distributing...we used to buy it regulalrly to make up repellant mixes for the horses). Care is needed with some essential oils - citronella oil and tea tree oil can cause skin reactions if applied neat. They do need diluting. Anti-histamine tablets to reduce any bite reactions sounds worth trying. In the tropics covered arms, legs, neck etc is pretty standard advice - definitely worth wearing early am and evening/night when mozzies most active.
Have a great trip!
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