How to realize a 3% caffeine-containing gel based on Carbopol without using alcohol?

By adding 2.2 g of nabenzoate 3 G coffe ï NE can be dissolved in 85 ml of water. If this solution is used for the preparation of 100 g Carbomeergel according to the indications of the TMF one obtains a liquid gel. But when one dissolves these two components under stirring in 95 g prefabricated carbomeergel dissolves after a while without the need of the gel.