Here is a good piece of equipment if you have kids or like to travel.

From here - Aspivenim

It's a suction mini-pump which painlessly removes all injected venom from insects (wasps, bees, horseflies, hornets...), arachnids (spiders, scorpions, harvest ticks...), fish (weevers, scorpion fish...) as well as certain rash-inducing plants.
Aspivenin®

steps -
1 - Gently place the nozzle best-fitted to the type and location of the sting or bite, then arm the pump by pulling out the piston all the way (half for children).
2 - With one hand, place ASPIVENIN® with its nozzle on the wound.
3 - Fully depress the piston and you feel a powerful suction. Let ASPIVENIN® act 20 sec to 3 minutes (Adjust the suction time according to the stings or bites : see the instructions for use.). This duration can easily be prolonged or renewed, especially in serious cases.
4 - Then lift the piston button with the tip of the thumb to remove ASPIVENIN®.

There is also another product that does the same thing available from amazon for outside the uk.

Sawyer Products B4 Extractor Pump Kit