The WFP also accepts direct (money) donations from individual donors.
TBH, I'm not sure it's possible to donate either to this or to "World Central Kitchen" and ensure your donation goes only to [food for] Gaza, since they run world-wide programs.
FWTW, WCK claims to serve around 350,000 meals per day in Gaza. The WPF around 300,000 it seems, but that probably doesn't include parcels. BTW, although the 200-ton ship made headlines, WCK shipped most of their food by truck from Egypt -- around 1,600 of them to date. That page also says the WCK serves around 170,000 hot meals per day in Gaza. Somewhere in the fine print, WCK partners with Anera for the local activities in Gaza. The latter is a US-registered charity as well, but they're focused on Palestinians. Anera does more than food themselves though, so if you dislike that, don't give to them directly. The Israeli press criticized Anera for not condemning Hamas, so there's that too.
Actually, since 2022, the WFP claims to allow small-share donors to direct their contributions to specific zones, through the Share-the-meal app. OTOH, besides being under the UN aegis, which some Israelis might find objectionable in itself, WFP also gives a non-trivial amount as cash assistance rather than just food. Their (logistics) overhead is also larger than that of other organizations (around 1/3), enough that the CharityWatch doesn't list the WFP, unlike the WCK. (They only list orgs with less than 25% overhead.) You can also look at the latter list for other ideas/orgs, but most that operate in the region aren't food-only.