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smoke
The commercial rigs were $1,100 in 1990.And I don't know if they'd produce the volume to fill the wake.
Shell makes an oil called something like 'Ondina',it's used in smoke generators,non-toxic.Just needs to be heated while soaked into some sort of matrix like steel wool.
Smoke bombs or smoke grenades would work.Not getting arrested would be the challenge,unless you could quench them on demand.
If you ever got rain,someone could film you from long distance as you pass in front of a dark,high-contrast background ( like a row of trees ).It really shows the water entrained within the wake.I get to see 18-wheeler wakes this way when its wet.
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