They are receiving bottles by the hundreds. Lets put that into the thousands (maybe even tens of thousands???)

Miniature bottles are available online for 0.32 US each, if you can't find them in your store.

Here's The original announcement for the campaign!

Roswell is HOT!"

It's time to get the WBs attention. So in addition to writing our
letters of support for our favorite show, we're starting a "Roswell's
HOT!" campaign. This will involve everyone sending in a bottle of
Tobasco with their letters. We want to have a united front and bombard
the WB with the bottles within a 3 week period. Various internet clubs
for different shows have attempted similar campaigns with great
results!

Here's what you can do:

Purchase a bottle of Tobasco, any size (they sell packs of mini bottles
in some stores, check http://www.tabasco.com/ for more info).

Mail Tobasco and a letter of support to the following:

Mr. Jamie Kellner, Chief Executive Officer
Ms. Susanne Daniels, President, Entertainment
Mr. Jordan Levin, Executive Vice-President, Programming

Address:

The WB
3701 Oak Street
Burbank, CA 91522

Individual mailings to the three people above will be most effective.

Somewhere at the top of your letter (but NOT on the outside of your
package) write our slogan "Roswell's HOT!". Remember to be courteous
and encouraging in your letter. And be concise- keep it short! The
visual of the Tobasco will be the important part, but your letter will
be the connection between the show and our campaign.

The key to this campaign is timing. For the next three weeks beginning
March 6th, let's overflow the WB with Tobasco and show them how strongly
we feel about our show! Let's set a deadline of March 27th as the
deadline for sending in your Tobasco and letters. The decision for
renewal will be made soon, so we want to keep Roswell fresh in their
minds.