Fiber like Benefiber in lots of water.
A smoothie with yogurt, fruit, ground flaxseeds, and a handful of baby spinach.
A one-time megadose of vitamin C.
The previously mentioned cup of coffee.
If you need meds, stool softeners (Colace) and milk of magnesia are probably the gentlest choices.
Amelia, married to Bear since 12/31/04; our daughter Rowan was born 8/6/09; our daughter Sapphira was born 8/17/12; due with DD3 6/17/15 (but after one two weeks late and one three weeks early, I'm not expecting a due-date baby!)