I've listed 25 different tarp shelter designs to help you get started. Each configuration has its pros and cons and there isn't really a perfect design for all occasions. You'll have to chose the righ(Try Design)
DO NOT buy any snakebite kit which depends on cutting open the skin! In most cases, the use of these kits has led to severe blood loss, nerve damage and have even hastened the bite victim's death! Better to get the more expensive vacuum/suction kits.