Hydrocolloids are substances that thicken and emulsify liquids when mixed with water. The best ones to use are xanthan gum, agar agar, guar gum, and methylcellulose.
To create the solution, combine xanthan powder, methylcellulose powder, and water at a 1-10-500 ratio. ½ ounce of the solution equals ½ ounce of egg white.
Gum Arabic is a naturally occurring hydrocolloid. It’s hardened sap from the acacia tree and is mixed with water and sugar to create a thickening egg-white substitute.