"Tobacco water" got rid of aphids in my tomatoes.
Bottles with a little bit of orange juice inside and a small hole ended fruit flies in my orange trees.

Tobacco water:
100ml of alcohol with 10g of minced tobacco. Let it rest for 24 hours.
100ml of water with also 10g of red pepper. Warm the water, grind the pepper and put them in the water, also, let it rest for 24 to 36 hours.
About 16g of coconut soap, melt it in warm water.

Sieve it all and mix. This is the base of it, mix with up to 3 liters of water and spray it directly in the plants leaves.

If you need bigger amounts, make the recipe with the same proportions.