Hi,
Putting the ZipSeals on/off is sometimes very challenging, especially the neck-seal and the ZipGloves. Conversely the normal wrist zipseals are easy to put on even when no soapy water is available.
In the field, I use a
sponge 
which contains some
soap to lubricate the zip seal. I store it in a very small tupperware container. Easier to carry in the dive bag than a bottle of soap, and no leaks.
Kind regards.
Cyrille