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Sealant doesn’t need to be applied to the bolts, but it can be a good way to stop an active leak in the moment. However, don’t rely on it as a cure-all; instead, make sure to fix the problem at the source by changing or tightening the bolts. 

If you do use sealant, make sure to spread it thickly and evenly across the bolts and the tank's porcelain.

Recaulk your toilet at least every five years. If you feel like your toilet is getting wobbly before that, it still might be time for a new caulking. Never directly place new caulk over existing caulk because that doesn’t produce lasting results. Also, caulking over existing moldy caulk does not kill out the mold by suffocating it, so if you have mold, be sure to get rid of it before recaulking.

Yes, and no. Your shower, toilet, and sink all connect to the same main drain, but the secondary drains going from each fixture to the main drain are usually separate. This isn’t always the case—especially in older homes—but since toilets contain black water and showers, tubs, and sinks have grey water, toilets are more regulated and come at a greater risk of contamination. It’s best to keep these drains separate using individual waste collection for this reason.

Yes, you can have a toilet without a septic tank. However, it will have to be a composting toilet. Composting toilets work similarly to aerobic septic systems in that the waste, which sits in a separate compartment below the toilet itself, is slowly broken down by aerobic bacteria. These toilets typically have a vent to get rid of harmful gasses with a fan, which requires a battery. You will have to dispose of waste in the toilet manually every three weeks to every three months, depending on how many people are using the toilet.