Well for eating & drinking as I posted earlier, I carry a comb again.  before eating I  comb the stach to the sides, and then as necessary and wipe well with a napkin.  I've also learned to accept that this is not a perfect science.  So after eating a quick trip to the men's is sometimes in order to apply some water to the stach to remove some left overs and then comb it into shape again.  It's a bit of a problem at first---admittedly--but I've gotten better both and prepositioning the stach before eating and cleaning up after.  Some things require a little extra care, creme style soups, a hot dog with chili--those can be a challenge. 
And, after you get used to the longer length that was a challenge, I've even let it get longer. You may be tempted to after a rest at your current length.   I'll post up another shot of the "growth" in about a week or so and show the "system!"