If you have been around long enough you know once you open the little Rema Tip Top glue tube it will be dry the next time you use it. So my SOP is to carry a couple of inner tubes and just replace as needed.
Walmart sells an 8 oz can of SLIME brand Rubber Cement "for use with patches and plugs" that I have used. NAPA Auto Parts also sells some kind of vulcanizing fluid that I have used.
So when I'm home and at my leisure I patch my tubes with the Tip Top patches (the best IMO) and save opening the Tip Top glue (vulcanizing fluid) until I have an emergency on the road.