No, this pitcher will not filter bacteria. You would need the Seychelle pump or advanced water filter bottle. You could get a gravity water filter with ceramic filters.Seychelle Advanced Water BottleSeychelle Water Filter PumpGravity Water Filter

Yes, you can leave it out on your counter.

A shower filter is to small to fit enough media in it and the flow rate is to high to filter fluoride so it would only last a few days. You would need a whole house filter for that.

Yes, they do.

No, you would need the ProOne pitcher filter. Here is the link to it.ProOne Water Filter Pitcher

You would need the ProOne Pitcher filter. Here is a link to them.ProOne Water Filter Pitcher

They have a filtering capacity of around 200 gallons depending on your water quality.

This one will not affect your pH. If you would like one that does then you would need the Alkaline pitcher. Here is a link to them.Seychelle Alkaline pH Pitcher Water Filter

Yes if you aren't going to be using the filters for a week or two you should let them air dry and leave them out where the air can still circulate around them ( ie dish drainer or window sill etc ) When ready to use again you may have to filter and dump the first fill of the pitcher. ( You will know by the taste )

Here is the link to them.Seychelle Pitcher Replacement Filter

Orders usually ship next business day, and take 3-5 business days for delivery depending upon where you are in the USA

For well water, I would recommend the Propur pitcher as it also removes bacteria and can be used with untreated water. Here is the link to it.Propur Pitcher Water Filter

Yes, it does come with 2 filters.

Yes, they both filter the same contaminants. The only difference is the ph pitcher also raises the ph of your water

They are 10 3/4"

They have a filtering capacity of 200 gallons, usally4 to 6 months. Here is a link to them.Seychelle pitcher replacements

No, this one will not, you would need the Radiological Pitcher Filter. Here is the link to it Seychelle radiological pitcher water filter

It has a filtering capacity of approx 200 gallons.

Yes they are $35 for the set of two. Here is link to them Pitcher replacement filter

Filter cartridge has a filtering capacity of 150 gallons or 6 months of use

Yes there is a primer with every Pitcher filter and the replacement filters.

It has a filtering capacity of 150 gallons.

The regular filters do filter fluoride. All of Seychelle filters filter fluoride. Here is the link to them https://qualitywaterfilters4you.com/collections/seychelle-replacement-water-filters/products/replacement-filter-for-the-seychelle-regular-water-filter-pitcher