Reddit reviews M-D Building Products 71548 M-D Replaceable Caulking Cord, 1/8 in W X 90 Ft L, Gray
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Forms A Flexible Seal Inside Or OutsideSeals Crack Around Door And Window FramesCan Be Used To Seal Cracked Window PanesBrand Name: M-D Building Products
It would also be worth your while to find and fix the drafts you mentioned, inexpensively and without any permanent modifications to the property.
Outlet/switch insulators are cheap, easy to install, and effective.
If you feel cold air from the gaps between the wall and your window/door trim, stuff backer rod in the gaps. (It's similar to rolls of self-stick foam watherstripping, but doesn't have the "sticky". You can also cut it in half/quarter for smaller gaps.)
If the windows are drafty, install heat-shrink film kits on any you won't need to open (or adjust blinds on) over the winter. For windows you may need to open or that have thick blinds, use butyl "cord" weatherstripping. Squish it into the edges/corners of window frames/panes/etc. It's removable and is available in multiple colors.
(Source: I live in a 100+ year old house, with zero wall insulation and drafty original windows.)