To hook inline, only thing I saw was a UV light filter most where priced was $500+. But this amazon unit looks fairly affordable.
https://www.amazon.com/dp/B01NCQUE0X..._t2_B0110LTT1I
There are a few other options. You could go to a place like REI, Gander Mountain, Cabelas, etc. purchase was water filtration pump used for backpacking. There are a lot of good units out there. Many of them you can pump about a liter of water every minute. For cooking, just boil the water, length of time varies from study to study, but none every say for more then 5 minutes.
Another option, I have used backpacking is both Iodine and bleach. Iodine WILL leave a permanent stain! You can also use chlorine. Put water and chemical treatment in the FW tank and let it sit. I have not used Chlorine in 30 years, so I do not recall the ratio, and the taste is not good. But then the taste of Iodine is not much better.
As noted above, but I have never seen used at this volume/flow rate is UV. Water bottle scale, you insert a UV battery operated water filter, and let it sit in the bottle for about a minute to sterilize the water.
These are probably the best affordable options. If it was me, I would use a water pump. After the trip I would sanitize my FW system.