Fumed silica (brand name Cabosil) is a thickening agent. Inert and non-reactive but fluffy beyond belief. (Wear dust respirator and eye protection.) Add to liquid, stir to disperse, slowly tip container to gauge viscosity. Add more Cabosil as needed. Eventually, the viscosity will increase enough that your liquid will not pour. You have created a colloidal gel.
Congratulations & good luck. (PS: don't sneeze around this stuff!)
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