Particles aren’t really suffixes, but yes:
は ha -> wa を wo -> o へ he -> e
There are some other oddities, especially if you get into dialects (even in Edo/Tokyo dialect, ga can become more like na (with the n being a nasal kinda like ‘ng’ in ‘thingy’).
The modern orthography is so much nicer, though; trying to read old texts is interesting with no small kana at all and some things that were just terrible for writing v pronounciation.
Depends upon how you’re seeing liquid. If you just mean water, definitely not. If you mean things that behave like liquids behave or are in their liquid phase (is magma liquid here?) then I’m not sure