Lasers blind and damage camera CCDs, and a super soaker full of paint will stop them from being effective. Helium balloons trailing fishing line will ensnare drones, and if you put some tinfoil on the balloons they will interfere with radar.
An unshielded domestic microwave magnetron will jam radio transmissions in an arc.
A sheet of aluminium provides defence against microwave area denial weapons, and a sheet of Perspex and some earplugs can defend against LRAD crowd dispersal machines.
You can make a field expedient gas mask out of a large plastic soft drink bottle and some duct tape.
Body-conforming Anti-less-lethal and taser armour can be quickly knocked up with PVC pipes, a hacksaw, and a heat gun.
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