Since you have three months, I would start by not putting any TP in the toilet and adding an inch or two of water and something to break down the solids before the first dump and see if that works. If not, add 2 more inches and so on. Since you probably have unlimited water and ability to dump, adding lots of water seems like an easier solution than having to "swizzle" it every time. TP is what always seemed to clog my boat head, no matter what I did. Once I convinced my wife not to put any in the toilet, my problems went away,
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