Both are put into bombs.

The main concern when it comes to tritium supply, regards tritium used for boosting of fission charges. Both applications are crucially important, but fusion boosting appears to require significantly larger quantities of tritium. Tritium and deuterium for boosting are supplied to the weapon from an external reservoir (gas bottle) as part of the arming process of the weapon.

Since about 5.5% of existing tritium decays every year, the tritium assigned to each weapon must be regularly replenished. This is done by removing the weapon’s tritium reservoir and exchanging it with a newly refilled reservoir (5). Figure 1.3 shows what may be such a reservoir.

From Norwegian Defence Research Establishment report "Tritium production":

https://publications.ffi.no/nb/item/asset/dspace:6780/20-013...

Also see this Savannah River Site page about tritium supply for weapons:

https://www.srs.gov/general/programs/dp/index.htm

And for a deeper dive, this fascinating blog post:

"U.S. Tritium Production for the Nuclear Weapons Stockpile – Not Like the Old Days of the Cold War"

https://lynceans.org/all-posts/u-s-tritium-production-for-th...