Or you could just use EV olive oil like most folks who play on plain gut. Other good choices are Almond oil, Walnut oil, Mink or Neetsfoot oil. Oil them once per week, rub the oil on with a piece of paper towel with a couple dabs of oil on it, wait 10-20minutes for it to soak in, wipe off any excess, and you're done!
Also clip any hairs that form with toenail clippers, that will help prevent unraveling. Sand the strings with some 400-600 grit whenever they get rough, oil them frequently and they will last for years. Plenty of info on gut string care over on the Rockabillybass.com forums, also.