Here you go, a script for the wunderfizz. Just to give you some hints, it only gives the perk, there are no effects that will happen. Script may also need to be modified just a bit but hopefully not much. If you would like it to work with other perks than the main four, then just message back. But here you go hopefully nothing else I forgot.

Wunderfizz()
{
	Cost = 2000;
	Trigger = GetEnt( "Wunderfizz", "targetname" ); //Wunderfizz might have to be changed to whatever targetname is or other way around
	Trigger SetHintString( "Activate Power" );
	Trigger SetCursorHint( "HINT_NOICON" );

	flag_wait( "electricity_on" );

	while(1)
	{
		Trigger SetCursorHint( "HINT_NOICON" );
		Trigger SetHintString( "Press &&1 for Wunderfizz Perk [Cost: " + Cost + "]" );
		Trigger waittill( "trigger", Player );

		if(Player.score >= Cost && !Player AllPerks())
		{
			Player maps\_zombiemode_score::minus_to_player_score( Cost );
			Trigger SetHintString( "-Giving Random Perk-" );

			while(1)
			{
				Rand = RandomIntRange( 0, 3 );

				if(Rand == 0)
					Perk = "specialty_armorvest";
				else if(Rand == 1)
					Perk = "specialty_quickrevive";
				else if(Rand == 2)
					Perk = "specialty_fastreload";
				else if(Rand == 3)
					Perk = "specialty_rof";

				if(!Player HasPerk(Perk))
				{
					Player thread GivePerk( Perk ); //Weapon/Drinking
					Player SetPerk( Perk ); //Sets Perk
        			Player perk_hud_create( Perk ); //Creates Icon
        			Player thread perk_think( Perk ); //Checks if down
        			break;
				}
				else
					continue;
			}
		}
		else
			self playsound("deny");
	}
}
AllPerks()
{
	if( self HasPerk("specialty_armorvest") && self HasPerk("specialty_quickrevive") && self HasPerk("specialty_fastreload") && self HasPerk("specialty_rof") )
		return true;
	return false;
}
GivePerk()
{
	self DisableOffhandWeapons();
	self DisableWeaponCycling();

	self AllowLean( false );
	self AllowAds( false );
	self AllowSprint( false );
	self AllowProne( false );		
	self AllowMelee( false );

	if ( self GetStance() == "prone" )
		self SetStance( "crouch" );

	gun = self GetCurrentWeapon();
	weapon = "";

	switch( perk )
	{
		case "specialty_armorvest":
			weapon = "zombie_perk_bottle_jugg";
			break;

		case "specialty_quickrevive":
			weapon = "zombie_perk_bottle_revive";
			break;

		case "specialty_fastreload":
			weapon = "zombie_perk_bottle_sleight";
			break;

		case "specialty_rof":
			weapon = "zombie_perk_bottle_doubletap";
			break;
	}

	self GiveWeapon( weapon );
	self SwitchToWeapon( weapon );

	self waittill_any("fake_death", "death", "player_downed", "weapon_change_complete");

	self EnableOffhandWeapons();
	self EnableWeaponCycling();

	self AllowLean( true );
	self AllowAds( true );
	self AllowSprint( true );
	self AllowProne( true );		
	self AllowMelee( true );

	if ( self maps\_laststand::player_is_in_laststand() )
	{
		self TakeWeapon(weapon);
		return;
	}

	if ( gun != "none" && gun != "mine_bouncing_betty" )
		self SwitchToWeapon( gun );
	else 
	{
		// try to switch to first primary weapon
		primaryWeapons = self GetWeaponsListPrimaries();
		if( IsDefined( primaryWeapons ) && primaryWeapons.size > 0 )
			self SwitchToWeapon( primaryWeapons[0] );
	}

	self TakeWeapon(weapon);

	if(perk == "specialty_armorvest")
	{
		self.maxhealth = level.zombie_vars["zombie_perk_juggernaut_health"];
		self.health = self.maxhealth;
	}
}

It works without It needing the power on but when you set It to wait til electricity Is on It doesn't give you the perks after you turn on the power