I don't worry about using LDPE plastic myself. My DIY liquids are made in 5ml, 10ml and 30ml batches, so don't last long enough that I'd worry about putting them in glass.
Wizard Labs is a source for glass bottles, 30ml, 60ml and 120ml, they have amber and colbalt blue. I keep my nicotine solution in several of their 30ml amber bottles in the freezer to pereserve them until used one at a time.
Halo puts there liquids in 30ml colbalt blue glass with a glass dropper top (like what Wizard Labs sells). When empty I clean and reuse them. Could do the same with my Wizard Labs 8ml glass DIY flavor bottles as they empty (I also have grass dropper tops for them).