Inadequate fluid intake can lead to further digestive upset including further constipation and gas if bulky stools remain in the digestive tract.
[livestrong.com]
and (2) significantly increase stool water content and stool output, resulting in soft/bulky/easy-to-pass stools.
[ncbi.nlm.nih.gov]
Bloating, cramping, diarrhea, nausea, gas, increased thirst Oral bulk formers (Benefiber, Citrucel, FiberCon, Metamucil) Absorb water to form soft, bulky stool, prompting
[mayoclinic.org]