Indoor growing under lights is usually difficult and Sarracenia prefer strong sun. Spindly growth that is floppy usually indicates the plant needs more sun. Much less sun is needed when the plant goes dormant in the late fall through winter. Keep moist to wet and do not let the soil dry out. Periodic flooding is good as the escaping water carries away deposits that might otherwise accumulate to toxic levels.
Rain water can be excellent, depending on pollution.
Avoid salty water. Sprinklers can fill leaves of taller types and break or damage them. Use a slow soaking method such as a soaker hose or hand watering close to the soil's surface. We recommend a mix of two or three parts sphagnum peat moss to one part of sand. Sarracenia like acid, nutrient-poor, moisture retentive soil.