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tyvm for the helmet guide, should be very useful. I've already bought white overalls (boiler suit) and had been planning to use an outdoor lighting post topper, but too expensive and time consuming, especially when shipping factored in. All the 'detail' will done with EL wire.
I've seen these elsewhere, filled to 90%. I'm sure someone has written the expansion size of water somewhere :)Also saw some recommendation for salt water, as it apparently freezes lower and takes more energy to melt.
Sound Reactive LED Strip
Motion Activated LEDs
Arduino RGB LED Strip Controller
Hack your LED Strip with a Motion Sensor and Timer