One word: lazy.
In Tiamat bow...? From your account perspective, that's not necessary. I assume you have all the scythes from UE + 2 Rahab knives at least.backup option
The optimal setup for f2p water will be straightforward here: 3 FLB UE scythes + 2 FLB Rahab knives + 1 null special sword + 2 FLB UE bows + 1 FLB Vritria sword (this last slot is kinda a wildcard)... + Shingen spear.
... Provided you missed none of them.